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AUTOCAD CIVIL 2009 AND AUTOCAD CIVIL 3D 2009

Road Design Basics with AutoCAD Civil and Civil 3D

Contents
Introduction ..................................................................................................................................................................3 The Corridor Model ......................................................................................................................................................3 The Assembly ...............................................................................................................................................................4 Subassemblies .............................................................................................................................................................5 Leveraging Point, Link, and Shape Codes ...............................................................................................................6 Leveraging Targets ..................................................................................................................................................7 Superelevation .........................................................................................................................................................8 Conclusion.................................................................................................................................................................. 10 Appendix ..................................................................................................................................................................... 11 AutoCAD Civil 2009 and AutoCAD Civil 3D 2009 Subassembly Tables ................................................................ 12 Highway Design (New Construction): Lanes ......................................................................................................... 12 Highway Design (New Construction): Medians ..................................................................................................... 13 Highway Design (New Construction): Shoulders .................................................................................................. 14 Highway Design (New Construction): Bridge and Rail .......................................................................................... 14 Highway Design (New Construction): Daylight...................................................................................................... 15 Highway Design (New Construction): Channels and Retaining Walls................................................................... 16 Road Rehab and Widening ................................................................................................................................... 17 Urban Design ........................................................................................................................................................ 19 Generic Links and Marked Points ......................................................................................................................... 20 Subassembly Functionality References ................................................................................................................ 22 Subassembly Catalog Section References ........................................................................................................... 22

is inserted along this 3D path at user-specified increments. A 3D Chain represents an alignment and profile which control the horizontal and vertical aspects of the road. This paper explores the definitions and terminologies behind points. Figure 1. and channels. For example. The corridor can be shown in cross section views and earthwork and material volumes can be 3 . Lastly. This subassembly catalog has been condensed and added as a reference appendix to allow for easier exploration while highlighting the functions of each subassembly and providing common uses. and environmental. The Corridor Model Corridors are arguably the most powerful and sophisticated objects in AutoCAD Civil 2009 and AutoCAD Civil 3D 2009. highway design. In this document. including land development. an alignment. The goal of this document is to outline the fundamentals of road design through corridors while focusing on the behavior and function of assemblies and subassemblies. links and shapes— essential components for corridor modeling—and also addresses how subassemblies have the capability to respond to superelevation parameters when modeling complex transportation projects. profile.ROAD DESIGN BASICS WITH AUTOCAD CIVIL 2009 AND AUTOCAD CIVIL 3D 2009 Introduction The Autodesk civil engineering solution. Together the alignment and profile create a 3D Chain (Figure 1) with the alignment providing the horizontal aspect (x and y) and the profile providing the vertical aspect (z/elevation). technicians. To create a corridor. local roads. drafters. AutoCAD Civil 2009 software and AutoCAD Civil 3D 2009 software ships with a comprehensive catalog of various assemblies that can be used for a multitude of project types including road rehabilitation. which represents the cross-sectional shape of the road. and surveyors with targeted solutions for a broad range of project types. The assembly. and assembly are combined to form a 3-dimensional representation of a linear feature such as a road or channel. transportation. provides civil engineers. Similar points on the assembly insertions are connected using corridor feature lines—establishing the edges of the 3D model in the longitudinal direction. the focus will be on utilizing corridor models for road design exclusively. made up of AutoCAD Civil 2009 software and AutoCAD Civil 3D 2009 software. designers. surfaces can be derived from the corridor representing finished ground or any number of underlying surfaces. An assembly is then inserted along this path at user-defined increments and is connected longitudinally by corridor feature lines. The corridor model serves as the “backbone” of the design and from it many useful forms of information can be derived.

An assembly is made of up a combination of subassemblies such as sidewalks. you insert subassemblies for the inside lane. The resulting geometry is the design profile and at this point you have two of the three components needed to build the corridor. the complete composition of the road cross section can be represented from median to lanes to curbs to daylight and a designer can simulate a wide range of road components and behaviors. and many other design tasks.ROAD DESIGN BASICS WITH AUTOCAD CIVIL 2009 AND AUTOCAD CIVIL 3D 2009 calculated. like an intersection. it is common to create assemblies that represent only half of the cross section (i. shoulder. lanes. Then. calculate material volumes. For a more complex design. Then you sample existing ground surface information to create a profile of the current conditions of the road centerline. and many other variations to take place as the corridor progresses along its path. legal boundaries. outside lane. To construct an assembly. In this way. curb. and lanes. you now have a 3D model of the road design from which you can create surfaces. shoulder. For example. you simply “snap” the pieces together by accessing a subassembly from a tool palette and clicking an attachment point on the assembly baseline. Next you build one or more assemblies that match the information shown in the typical sections for the road design. you have a fully functional assembly that represents the cross-sectional geometry and composition of the design. The assemblies simulate the geometry and material composition of the road as well as how it should interact with existing ground. being a collection of subassemblies attached to a baseline. the assemblies become key parts of the model rather than the entire road cross section. the corridor can be viewed from a 3D perspective giving the designer a clearer sense of its construction when compared to a model that is purely numerical. and daylighting. and shoulders. each portion of the intersecting roads can be controlled independently to easily resolve the complex geometry often associated with intersections. you can modify the input parameters to match the dimensions of the typical section of the proposed highway. Figure 2. The assembly itself is actually a rather simple object. And. and daylight). With the three components in place you then build the corridor and assign targets to ensure that any subassemblies that interact with other drawing objects are seeking out the correct data. generate cross-section views. In this way. For any road design you begin by defining the main alignment which is typically the centerline of the road.e. working outward. which represent customizable cross-sectional components that are pieced together to create assemblies. With this portion complete. the assembly (Figure 2) is one of a trio of objects that comprises the corridor model. In a short time. which is the location where the assembly will attach to the alignment-profile pair. and many other potential features. In intersection design. These individual components are represented by subassemblies. As each subassembly is inserted. as shown in the image above. This profile is then redesigned to create a smooth vertical path consisting of straight tangents and vertical curves. The baseline contains a baseline point. lanes to widen. The Assembly As stated above. left lane. This interaction is automated by the subassemblies allowing slopes to change. or on another subassembly. to create an assembly for a divided highway. It represents the cross-sectional composition of the road including the individual components such as curbs. 4 . you begin at the baseline point and simply insert the appropriate subassemblies such as a depressed median or a jersey barrier.

The scope of their application ranges from very specific to very general and their functionality ranges from very sophisticated to very simple. In addition to the ones provided. The geometry and behavior of subassemblies is controlled by input parameters. custom subassemblies can be created from user-defined AutoCAD shapes or through programming. and when three or more links enclose an area. and display and labeling characteristics of the subassembly.ROAD DESIGN BASICS WITH AUTOCAD CIVIL 2009 AND AUTOCAD CIVIL 3D 2009 Subassemblies The power and flexibility of the assembly actually resides within the subassemblies. Some are manually entered by the user while others are derived automatically from another source of information within the drawing. Subassemblies are made up of points. a shape is created. The example shown will create a lane 12’ wide with a cross slope of 2% and a material course depth of 0. the Width parameter mentioned above can be manually entered or have its value automatically derived from an alignment representing the outer edge of the travel way. providing users with full control over subassemblies are points. Points are connected by links. and simplify the extraction of data. affect the appearance and behavior of the corridor. Codes and styles can be assigned to all three of these types of components to control how the corridor is constructed. Figure 4. 5 . Styles The fundamental components of can be assigned to each component. For example. links and shapes. Subassemblies can also be tied to the superelevation parameters of the alignment. For example. lanes will automatically adjust their cross-slopes through transition and full superelevation.67 feet for the duration of the road. shapes. automate annotation. for many of the lane subassemblies. the use of the alignment is established through a target parameter. Subassemblies can be “snapped” together in thousands of combinations to model virtually any road design scenario. For example. (Figure 3). In this case. For example. there is a parameter called Width which controls the width of the lane. any subassemblies that reference superelevation information will recognize the information contained in the alignment and respond to it. This ability of subassemblies to interact with other objects in the drawing and derive values automatically greatly increases the power of the corridor model. as the corridor is built. Other input parameters include the depth for each pavement course or the slope across the lane (Figure 4). Input parameters allow specific components within subassemblies to be customized to fit specific project requirements. links. The sources of the values for these parameters vary depending on the intended function of the subassembly. Figure 3. AutoCAD Civil 2009 and AutoCAD Civil 3D 2009 provide an extensive collection of subassemblies for a wide variety of road design applications.

ROAD DESIGN BASICS WITH AUTOCAD CIVIL 2009 AND AUTOCAD CIVIL 3D 2009 Leveraging Point. Possibly the most important properties are point codes. Codes. 6 . For example. the BasicLane subassembly assigns a code of ETW to the outer top corner (Figure 5). Note how the Figure 5. When the corridor is built. Note also how the style of the corridor feature line has been assigned in Corridor Properties based on this code. the Top_Curb code was used to automatically provide a label in all section views showing the offset and elevation of the top of curb. Codes can also be leveraged to help save considerable time by automating the annotation of corridor information. In the example above. connects the points coded ETW. AutoCAD Civil 3D 2009 recognizes the matching codes between two adjacent subassemblies and draws a corridor feature line that connects them. Codes can be used to perform functions such as calculating material volumes or performing a mass haul analysis. Figure 7. are also a powerful tool for extracting data from the corridor model including contours. (Figure 7) Figure 6. In addition. for that part of the corridor. link. P2 represents a corridor feature line created by AutoCAD Civil 3D automatically point on the subassembly that has the name ETW (edge of travel way) assigned to it. and shape codes—properties of a subassembly—can be used for a multitude of applications. as they control the creation of corridor feature lines that form the longitudinal edges of the corridor model. This example shows a finished grade surface reading the Top codes to create contours from the model. Corridor feature lines will automatically connect ETW points as the corridor is created. the Top code is used to filter out all links representing the finished ground element of each subassembly. cross sections. specifically link codes. The result is shown in Figure 6 below. Each feature line can be assigned a style to control the display. Figure 8. A similar approach can be used to generate corridor surfaces representing subsurface materials or portions of the corridor. the style that is applied to the corridor feature line can be defined by this code and automatically assigned. a corridor surface for the finished ground can be created in a matter of seconds. and Shape Codes Point. or surfaces. With this approach. Link. Codes can also be used when creating or extracting data from the corridor model. In the example shown in Figure 8. In the example shown in Figure 9.

For instance. 7 . labels. and styles so that your design is labeled automatically with the content and formatting required by your company standards. crown. the codes are organized by type (link. In addition to being used for automatically labeling cross sections and plan sets. each link code can be assigned a render material for visualization purposes and a material area fill for hatching within the drawing (Figure 11). This example shows Top_Curb codes being used to label cross sections. and shape). Each point code can be assigned a feature line style so that corridor feature lines can be matched up with their functions. Daylight subassemblies use a surface target parameter to seek out and intersect surfaces based on input parameters. point. AutoCAD Civil 3D 2009 software manages all of the codes that can be associated with a corridor through the use of a code set. Offsets and elevations are automatically derived from the corridor model and conform to company or jurisdictional CAD standards. and then uses input parameters to tie into a surface. In addition. Their job is to seek out and intersect with a given surface according to the instructions provided in the input parameters. Figure 10. code set styles can be easily configured for visualization purposes. all daylighting subassemblies function through a surface target parameter. Leveraging Targets Many AutoCAD Civil 3D 2009 subassemblies have the ability to interact with other objects in the drawing through target parameters. Each code can be assigned a label style to create the effect discussed above. corridor feature lines passing through the Top_Curb code shown above could be assigned a style that displays them on the curb layer (Figure 6). Code set styles can be setup to automatically label specific points such as flow line. For example. For example. Figure 12.ROAD DESIGN BASICS WITH AUTOCAD CIVIL 2009 AND AUTOCAD CIVIL 3D 2009 Figure 9. With this capability. DaylightMaxWidth Subassembly analyzes whether a cut or fill situation exists. top of curb. a client’s standards or a given local jurisdiction (Figure 10). you can integrate codes. Figure 11. Capitalizing on this potential for automation can greatly improve the efficiency of displaying and documenting the road design throughout the design cycle. etc. Within the code set.

And finally. grading projections can clean up on each other and provide easy solutions for complex designs. Daylighting can also be accomplished through feature lines and grading projections. the DaylightMaxWidth subassembly shown in Figure 12 will seek out a surface and tie to it while maintaining a given width for the daylight embankment. It also allows you to take advantage of the ability of AutoCAD Civil 3D grading projections to “clean up” interior corners and interact with one another. Instead of using a daylight subassembly. Unlike daylighting methods. and/or adjust slope depending on the material being excavated. or survey figures as targets to control the shape of the corridor. Superelevation parameters can be found by accessing the alignment properties and clicking the Superelevation tab. allowing them to seek out a specific location on another subassembly and connect to it. In order for a daylight subassembly to function properly. a target surface of EG has been assigned to the DaylightMaxWidth subassembly within the corridor. Part of the process of constructing the corridor model is to assign the Figure 14. Figure 13. polylines. a target surface actual targets for subassemblies that is assigned within the corridor properties. utilize target parameters. certain subassemblies can target a marked point. Other subassemblies utilize width or offset target parameters to change shape as they progress through the corridor. feature lines. 8 . ditches and berms. in the example show in Figure 15 a profile could be applied to the edge of the travel way to control its elevation at the same time the alignment is controlling its horizontal position. it is possible to use the grading creation tools in AutoCAD Civil 3D 2009 to project slopes from a corridor feature line. Figure 13 shows how AutoCAD Civil 3D can automatically calculate the solution between the corridor daylighting and the pond daylighting. for example. Slope or elevation targets can be utilized for some assemblies to control the vertical aspect of the corridor geometry. Specific subassemblies can use alignments. This subassembly will seek out a marked point on the ramp and automatically create a swale between the two roadways. A turning lane. As shown in the Figure 14. Figure 15 shows the final result when this approach is used. is often used in the area between a ramp and highway as the two merge. LinkBetweenPoints for instance.ROAD DESIGN BASICS WITH AUTOCAD CIVIL 2009 AND AUTOCAD CIVIL 3D 2009 Many different daylighting scenarios can be modeled using the daylight subassemblies provided with AutoCAD Civil 3D 2009. The superelevation parameters themselves are actually applied to the corridor baseline alignment and the subassemblies that possess superelevation functionality derive the information from there (Figure 16). This is made possible through the use of grading projection from a feature line that is dynamically linked to the corridor. profiles. the subassembly widens to create the additional lane. Superelevation Many subassemblies have the capability of responding to superelevation parameters. For instance. For example. This can be especially advantageous when slope projections need to be perpendicular to a feature of the road rather than the centerline. As the alignment moves away from the road centerline. Other daylight subassemblies can automatically create benches. can be accomplished by using the BasicLaneTransition subassembly along with an alignment target representing the edge of the travel way. Superelevation is the banking effect of the road as it curves causing the edge to the outside of the curve to be higher in elevation than the inside. The table in the Appendix shows a complete list of the daylighting subassemblies that are available and some of their more common uses. Figure 15.

An example of superelevation being applied to a divided highway. in the Alignment properties. 9 . As an example. The values can be entered manually or calculated automatically based on AASHTO tables used by AutoCAD Civil 3D 2009 software. Figure 18. Figure 17. any subassemblies that possess superelevation functionality will read these values and respond as needed. The superelevation parameters consist of eight separate cross slope values that represent inside and outside shoulders and lanes on both sides of the road. the LaneOutsideSuper subassembly is using data from the Outside Lane column. you can use the Design Criteria Editor to create tables that meet nearly any design standard. as the corridor enters superelevation transition. Subassemblies can then use these values as the superelevation is being applied throughout the design. It will maintain that configuration for a specified distance and finally transition downward as the corridor passes beyond the curve. and begin full super. Figure 17 shows a corridor as it progresses through each key superelevation station. Figure 18 shows how the LaneOutsideSuper subassembly uses the Outside Lane column to obtain its cross slope. the outside edge of the subassembly gradually tilts upward until it reaches full superelevation.ROAD DESIGN BASICS WITH AUTOCAD CIVIL 2009 AND AUTOCAD CIVIL 3D 2009 Figure 16. reverse crown. Superelevation parameters can be applied during the layout of the horizontal alignment. If your design does not apply AASHTO design standards. and creates additional corridor sections at those locations to ensure accurate transitioning. In the example above. Civil 3D automatically calculates key stations such as end normal crown. As AutoCAD Civil 3D 2009 builds the corridor. Custom tables can be saved. The section view shows how. then shared throughout your organization and used on future projects.

shape codes and target parameters. links. This paper has also exposed the capabilities of AutoCAD Civil 2009 and AutoCAD Civil 3D 2009 for transportation type projects—identifying how subassemblies can respond to the banking effect of the road throughout the design. In addition. you will be able to construct more effective corridor models more efficiently. Superelevation is used all over the world on a multitude of project types and when used in conjunction with the model-centric capabilities offered in the Autodesk Civil Engineering Solutions software. annotating. you can create corridor models that are tailored to your designs needs—while helping to automate many road design tasks such as automatically labeling and updating cross sections. This document has given you an overview of the core components that AutoCAD Civil 2009 and AutoCAD Civil 3D 2009 use when modeling roads and highlighted the fundamental building blocks required when piecing together assemblies and subassemblies. 10 . By thoroughly understanding the subassemblies and their functions. by leveraging points. and analyzing your road design more efficient—especially when all of the benefits of subassemblies are leveraged.ROAD DESIGN BASICS WITH AUTOCAD CIVIL 2009 AND AUTOCAD CIVIL 3D 2009 Conclusion The AutoCAD Civil 3D 2009 corridor model can make building. it provides engineers with a valuable resource for creating compelling designs for years to come.

ROAD DESIGN BASICS WITH AUTOCAD CIVIL 2009 AND AUTOCAD CIVIL 3D 2009 Appendix 11 .

independently A simple pavement structure with userdefinable point.MC SB A crowned lane with separate subbase slope Crowned road where control and the ability to control the location subgrade slope and of the subbase crown.V. CrownedLane GenericPavementStructure H. SE. This subassembly is commonly used for general-purpose lane creation. direction TD-L SU-L Lane that responds to Inside Lane superelevation value.MC TD-L LaneInsideSuper LaneInsideSuperLayerVaryingWidth Lane that responds to Inside Lane superelevation value and allows independent widths for each pavement course. Up to 10 different courses can be specified. LaneFromTaperedMedian1 Maintains the cross slope of the lane while extending it inward to create a left turn lane. Any pavement course. in one travel direction. SE. 12 . four courses.V. VS TD-L H.V.V. Multi-lane lane roads with superelevation.MC TD-L H.V.MC TD-L SU-L H.ROAD DESIGN BASICS WITH ITH AUTOCAD CIVIL 2009 AND AUTOCAD CIVIL 3D 2009 AutoCAD Civil 2009 and AutoCAD Civil 3D 2009 Subassembly Tables The following tables can be used as a guide when selecting subassemblies for different types of design scenarios. SE.SE UD TD-L SU-L H. SE.MC median. crown needs to be controlled independently. Each subassembly is listed with a brief description and one or more common uses. and shape codes. SE. Highways with multiple lanes in one travel direction.V. that it allows for two lanes outside the lanes – multiple lanes SE. All road lanes.V. SE. Lane that responds to Outside Lane superelevation value and allows independent widths for each pavement course. SE. The meaning of the codes in the Ref column can be found at the end of the appendix.MC TD-L H. lanes LaneOutsideSuper LaneOutsideSuperLayerVaryingWidth Pavement structures requiring more than four courses with varying widths. Highway Design (New Construction): Lanes Image Name Description Common Uses Ref: H. Lane that responds to Outside Lane superelevation value. Pavement structures requiring more than four courses with varying widths. link. SE. Works in conjunction with an alignment defining the median edge.VS. LaneFromTaperedMedian2 Similar to LaneFromTaperedMedian1 except Medians with left turn H. Up to 10 different courses can be specified.V.MC TD-L SU-L LaneBrokenBack Two travel lanes with independent crossslopes. These codes refer to specific functionality possessed by each subassembly as well as where the subassemblies can be found in the AutoCAD Civil 3D 2009 catalog. LaneInsideSuperMultiLayer Similar to LaneInsideSuper except that there Pavement structures requiring more than are additional available pavement courses.MC TD-L H.V. direction Medians with left turn lanes.V.MC. superelevation H.

SE.V.UD TD-L SU-L LaneTowardCrown ShapeTrapezoidal Irregular-shaped pavement courses and other structures.V. Pavement structures requiring more than four courses. when in superelevation. Similar to MedianDepressedShoulderExt except that shoulder termination is vertical rather than extending under the ditch slope. VS TD-M MedianDepressedShoulderVert MedianFlushWithBarrier Divided roads or highways. SE. MedianRaisedWithCrown SE TD-M SU-M 13 .ROAD DESIGN BASICS WITH AUTOCAD CIVIL 2009 AND AUTOCAD CIVIL 3D 2009 Highway Design (New Construction): Lanes LaneOutsideSuperMultiLayer Similar to LaneOutsideSuper except that there are additional available pavement courses. Divided roads or highways requiring a depressed median.V. Depressed Median with various options for superelevation rotation and subgrade extension. Divided roads or highways requiring a depressed median. Divided roads or highways where curbs define the edges of the median. Creates a cap for a raised median between the attachment point and a marked point. Depressed median between an attachment point and marked point with various parameters to control ditch geometry. regions using a formula based on the radius widening is required SE. MC TD-M SU-M TD-M SU-M MedianRaisedConstantSlope Divided roads or highways where curbs define the edges of the median. Similar to MedianRaisedConstantSlope except that the median cap is crowned by applying slope values either manually or through superelevation. SE.MC. Subsurface courses that can be set to match the structure of abutting lanes.SE.E. Multi-lane roads with superelevation. H. VS TD-M SU-M TD-M SU-M MedianConstantSlopeWithBarrier MedianDepressed MedianDepressedShoulderExt H. Creates a median that is flush with adjacent lanes and can include an optional jersey barrier. The cross slope of the top of the median is constant at a given section.V. Ref: H.V. H.E. H.MC TD-L of the curve and the length of the wheelbase. Creates a lane that slopes downward from the crown to the centerline by applying the negative of the outside lane superelevation value from the opposite side of the road.VS.V.MC TD-L H. SE. SE. Divided roads or highways requiring a depressed median.SE. VS TD-L LaneOutsideSuperWithWidening Automatically widens lane in superelevated Highways where lane H.ES TD-M H. There is also a parameter to incorporate interior turn lanes. Generic shape with user-defined geometry and codes. Common Uses Divided roads or highways where asymmetrical barriers are needed. Highway Design (New Construction): Medians Image Name Description Flush median with independent left and right jersey barriers and subsurface courses that can be set to match the structure of abutting lanes.V.

ShoulderMultiLayer ShoulderMultiSurface Similar to ShoulderMultilayer except that it includes independent paved and earthen shoulder areas. Each course can be assigned an independent extension into the daylight slope as well. Shoulders requiring more than 4 courses where the base and subbase material extends to the daylight slope. ShoulderVerticalSubbase Shoulders that require an unpaved widening when in cut or on the high side of superelevation. Common Uses Small bridges and overpasses. MC.ES TD-S daylight slope.MC. TD-B 14 .E MC. Shoulders with an integrated ditch. All courses are extended to the daylight slope. courses extend to the MC.SE TD-B BridgeBoxGirder1 BridgeBoxGirder2 Two-chamber box girder bridge section with optional half-barriers.SE.SE. Common Uses Ref: Shoulders where all H.ES TD-S SU-S ShoulderWithSubbaseInterlaced ShoulderWithSubbaseInterlacedAndDitch Highway Design (New Construction): Bridge and Rail Image Name Description Box girder bridge section with optional halfbarriers.E MC. with an optional unpaved area outside of the shoulder that can be inserted based on cut/fill and superelevation conditions. Shoulder with subbase materials terminating at the edge of the shoulder. Shoulders requiring subbase material to be interlaced with base material. The top two pavement courses have variable extensions into the daylight slope. MC. Similar to ShoulderExtendSubbase with additional base and subbase courses. ShoulderWithSubbaseInterlaced plus a parabolic ditch. and sub-ballast. H.ROAD DESIGN BASICS WITH AUTOCAD CIVIL 2009 AND AUTOCAD CIVIL 3D 2009 Highway Design (New Construction): Shoulders Image Name Description Shoulder with all courses extended to the daylight slope.E TD-S and earthen areas. VS TD-S ShoulderExtendAll ShoulderExtendSubbase Shoulder with subbase extended to the daylight slope.SE. H.ES TD-S SU-S H.E.SE. Ref: H. Small bridges and overpasses.E. SE TD-S SU-S H. Shoulders with paved H. Shoulder which allows the adjacent lane pavement structure to be extended into the shoulder material and interlaced with the shoulder subbase material. H.SE. ballast.SE TD-B RailSingle Railroad section including rails. SU-S Shoulders where only the subbase material extends to the daylight slope.ES.SE.ES TD-S SU-S H.D. Railroads.

If the daylighting.LM TD-D slope is needed to stay outside of a minimum a boundary or SU-D offset from the baseline. D.LM TD-D SU-D DaylightMinWidth DaylightMultiIntercept DaylightMultipleSurface 15 . daylighting daylight falls outside the ROW.D. Daylighting in “rough” D. Daylighting outside of H. obstacle TD-D SU-D Daylighting within a H.LM TD-D terrain where a different intercept point may be needed. Generalized daylight solution providing many General purpose parameters to create a basin. berm. topsoil.LM boundary or obstacle. Daylighting that forces the cut or fill slope to pass through the surface multiple times to intersect at a more distant location. obstacle TD-D SU-D DaylightMaxWidth DaylightMinOffset Typical slope is applied unless a less steep Daylighting ylighting outside of H. ditch. daylighting daylight condition.LM TD-D a boundary or SU-D obstacle.LM SB DaylightBasin Daylighting where a basin or ditch is required. DaylightBench Large cut or fill slopes D. Creates a basin in a cut situation or a basin. or simple daylighting.D.LM TD-D where benching is required. obstacle. Creates cut of fill slopes with repeating benches as needed. encountered D. Up to three surfaces can be specified (i.LM boundary or obstacle.ROAD DESIGN BASICS WITH ITH AUTOCAD CIVIL 2009 AND AUTOCAD CIVIL 3D 2009 Highway Design (New Construction): Daylight Image Name DaylightRockCut Description Daylights using two target surfaces (existing ground and rock) with varied slope and ditch solutions based on conditions encountered. OD TD-D H.LM TD-D SU-D DaylightInsideROW Daylights using a typical slope as long as the Subdivision road daylight is within the ROW limits.LM. Typical slope is applied unless a steeper slope is needed to stay within a maximum offset from the baseline. Ref: D. Basin walls are comprised of two slope segments whereas ditches only contain one. clay. Similar to DaylightMaxOffset except that the width of the daylight area is used instead of an offset from the baseline. alignment. Common Uses Daylighting for deep cuts.D.D.H. D. It also includes an optional guardrail.V.OD TD-D SU-D DaylightBasin2 Similar to DaylightBasin except that the berm Daylighting where a is optional in a fill condition and the berm and basin or ditch is basin widths can be controlled by an required. the slope can be steepened or held based on other parameters.D.V. Similar to DaylightMinOffset except that the width of the daylight area is used instead of an offset from the baseline.LM. OD TD-D SU-D DaylightMaxOffset Daylighting within a H. Allows varying cut slopes depending on the material type being excavated. DaylightGeneral D. rock).e. LM. and fill slope for a fill situation. needed Deep cuts where multiple material types are encountered.

Daylights from the attachment point to a given offset from the baseline. H. Roadside channels. Similar to Channel except that the bottom is parabolic in shape.V. Marked points are placed at the ends of the backslopes so that other corridor components can be tied to them. shoulder. Channel ChannelParabolicBottom H.LM a boundary or feature.D. Retaining wall where there is limited space on the low fill side for the footing.V CR Ditch Flat or V-shaped ditch with user-defined horizontal and vertical control parameters and an optional lining material depth. Medium.D CR RetainWallTieToDitch Retaining wall with optional barrier. and the ability to tie to an existing the retaining wall is ditch. fill.D CR RetainWallTapered Retaining wall with one tapered side and an Retaining walls.D.OD. Similar to RetainWallTapered but typically High retaining walls. V.D CR RetainWallToLowSide RetainWallVertical V. conditions. and Steep) based on daylighting.D CR RetainWallTaperedWide V. or either condition. Highway Design (New Construction): Channels and Retaining Walls Image Name Description Common Uses Ref: H. TD-D SU-D DaylightToROW Similar to DaylightToOffset except that an offset adjustment can be applied so that daylighting occurs a given distance within or beyond the ROW offset. Vertical retaining walls. LM TD-D SU-D DaylightStandard DaylightToOffset Daylighting directly to H. Similar to RetainWallTapered except that both sides of the wall are vertical.D.ROAD DESIGN BASICS WITH AUTOCAD CIVIL 2009 AND AUTOCAD CIVIL 3D 2009 Highway Design (New Construction): Daylight Daylighting which applies one of 3 preset General purpose slopes (Flat.LM a boundary or feature. MC CR V. The vertical side is always faced to the low side and the elevation of the footing is based on a target surface and specified cover requirement.V CR Trapezoidal channel with optional lining and Roadside channels. A parameter can control whether the ditch is inserted in cut. backslope links. adjacent to a ditch or walk. Roadside ditches.SE. Urban areas where walk area. used for high retaining walls (18 ft or higher). optional key. V. D. Similar to RetainWallTapered except that all of the footing is located under the high fill side. It creates a ditch in cut situations and an optional guard rail for widening or steep fill conditions.D CR 16 . TD-D SU-D Daylighting directly to H.

or entered manually. Ref: H. sideslopes. Common Uses Overlay of four-lane road. CR SideDitchWithLid Concrete-lined ditches or channels with grates or lids. CR D.D RE TD-R OverlayMillAndLevel2 17 . than a single overlay slope.V travel lanes inward along their existing cross highway to the inside. Creates a trapezoidal nose barrier with the ability to tie the back of the barrier into an existing surface. U shaped ditch with variable wall thicknesses. and optional foreslope. Creates a crowned road surface between two existing edges of pavement. two slopes define the crown of the road. Rather overlay (crowned).D. RE TD-R OverlayMedianSymmetrical OverlayMillAndLevel1 Provides milling or leveling as needed. Resurfacing a road with poor crown definition. gutter to the curb flowline on each side.UD CR SimpleNoiseBarrier Road Rehab and Widening Image Name OverlayBrokenBackBetweenEdges Description Creates a four-lane crowned overlay between existing gutter flange points on either side. Similar to OverlayMedianAsymmetrical except that the cross slopes are adjusted so that the extend lanes meet at the centerline. Similar to OverlayMillAndLevel1 except that it Two-lane pavement is intended for a crowned roadway. CR SideDitchUShape Concrete-lined ditches or channels. H. OverlayCrownBetweenEdges OverlayMedianAsymmetrical Widens a divided highway by extending the Widening a divided H. which Single lane pavement H.D. Noise barriers or berms.D. RE TD-R slopes.V highway to the inside. Benches can be specified inside and outside the ditch as well as an optional foreslope link. The overlay slope can be crowned). set to match superelevation. You can also specify a ditch wall depth for lined ditches.V RE TD-R H. set to match existing. An asymmetrical barrier is provided that resolves the elevation difference caused by extending the slopes inward. Widening a divided H. A topsoil thickness may be applied. Similar to SideDitchUShape except that a lid can be included and the side slopes of the ditch controlled through input parameters.V RE TD-R H. Roadside ditches.D.D.V RE TD-R OverlayBrokenBackOverGutters Similar to OverlayBrokenBackBetweenEdges Overlay of four-lane except that the overlay extends over the road.D RE is then topped with an overlay of useroverlay (not TD-R specified depth.ROAD DESIGN BASICS WITH AUTOCAD CIVIL 2009 AND AUTOCAD CIVIL 3D 2009 Highway Design (New Construction): Channels and Retaining Walls SideDitch Simple ditch with parameters for bottom width.

ROAD DESIGN BASICS WITH AUTOCAD CIVIL 2009 AND AUTOCAD CIVIL 3D 2009 Road Rehab and Widening OverlayParabolic Creates a parabolic overlay between two existing pavement edges.D. TD-R OverlayWidenMatchSlope2 Similar to OverlayWidenMatchSlope1 except Overlay and widen on H.V.D.MC RE one side.V. Overlay of urban road. both sides. StrippingTopsoil H.D RE TD-R D TD-D OverlayWidenWithSuper1 StrippingPavement Topsoil removal. Similar to UrbanReplaceCurbGutter1 except that the vertical placement of the curb is controlled by a profile. VS RE TD-R H. Strips pavement to a given depth starting at the attachment point and working inward to the baseline. H. Pavement removal.D. TD-R Similar to OverlayWidenMatchSlope1 except Overlay and widen that the cross slope is set according to with superelevation. Replaces an existing sidewalk by beginning at the outside edge and extending inward at a given width and slope. 18 . Strips topsoil to a given depth from the attachment point to a given stripping width. tie the edge of a sod strip to the existing inside edge of a sidewalk.D.D.D. VS RE TD-R UrbanReplaceCurbGutter2 H. from curb inward. MC RE TD-R OverlayWidenFromCurb Similar to OverlayWidenMatchSlope1 except Overlay and widen that it extends inward from a curb flange.V.D.D TD-D UrbanReplaceCurbGutter1 Replaces an existing curb and gutter and can Curb replacement. then provides widening at a cross slope that matches the existing road.V RE TD-R H. superelevation. Curb replacement. H. OverlayWidenMatchSlope1 Overlays the existing road.V RE TD-R UrbanReplaceSidewalk Sidewalk replacement.MC RE that it widens on two sides. Vertical placement of the curb is controlled by allowable mill and/or overlay and allowable ranges of slopes for the sod strip. Overlay and widen on H. H.

LM. Daylighting that creates an optional flat or vshaped ditch in a cut condition and a simple fill slope in a fill condition.V GS Simple daylighting. TD-L SU-L GS BasicLane BasicShoulder GS Any road design where there is a constant shoulder width and no material volumes are needed. adjusted in size and shape through a number traffic control during of parameters. The vertical placement of the trench is controlled by a profile which typically represents the pipe to be installed. sidewalks TrenchPipe1 Creates a flat-bottom trench with equal sideslopes and up to three layers of backfill material.P SB 19 . daylighting BasicSideSlopeCutDitch D. excavation TrenchPipe2 D. excavation D TD-U SU-U Pipeline excavation. Width of the trench is determined by a user-specified width and minimum pipe cover. Any road design. Any road design where there is a constant lane width and no material volumes are needed. Simple rectangular sidewalk section with optional buffer areas on either side. GS BasicCurbAndGutter LaneParabolic Any road design where parabolic arabolic lane is required. The gutter slope can also be set. OD GS BasicSidewalk Residential and urban GS roads with sidewalks. Available parameters control width. Turning lanes. A simple lane with no subsurface courses. width. Available parameters control width. and slope. It is a “rigid” shape with no target parameters. Builds trench around one or two pipe networks. depth. A simple shoulder with no subsurface courses. BasicGuardrail Any road design. Simple rectangular curb. It is a “rigid” shape with no target parameters. BasicCurb All road and parking lot curbing. and slope.ROAD DESIGN BASICS WITH ITH AUTOCAD CIVIL 2009 AND AUTOCAD CIVIL 3D 2009 Urban Design Image Name BasicBarrier Description Common Uses Ref: GS A simple jersey barrier which can be Highway medians. design GS BasicLaneTransition Simple lane in which the width and outside elevation can be controlled through target parameters. design GS Simple guardrail structure. depth. and slope can be adjusted. Creates a simple parabolic shape where the crown height. lanes H. It is a “rigid” shape with no target parameters. A simple curb and gutter in which the height and width of the curb and gutter can be adjusted through a number of parameters. Pipeline excavation. construction. Slope is calculated using a “string line” attached to left ETW and right ETW.

V. Generic Links and Marked Points Image Name Description A special subassembly that applies selected subassemblies based on whether there is a cut or fill condition. UrbanCurbAndGutterValley2 Urban or residential curbs. Subdrains TrenchWithPipe V TD-U SU-U UrbanCurbAndGutterGeneral Urban or residential curbs. The vertical placement of the trench is set at the attachment point and the depth can be entered manually or controlled by a profile. VS. 20 . Offset and elevation can be controlled by target parameters. excavation D.ROAD DESIGN BASICS WITH ITH AUTOCAD CIVIL 2009 AND AUTOCAD CIVIL 3D 2009 Urban Design Similar to TrenchPipe2 except that it utilizes two target surfaces (existing ground and rock) and applies a different sideslope depending on which condition is encountered. boulevards. then becomes flat beneath the curb. Pipeline excavation. Similar to UrbanCurbAndGutter-Valley1 except that the bottom is sloped.UD. purpose H. Creates a standard curb and gutter shape with input parameters for the dimensions. Creates a stone-filled drain structure with a circular pipe inside.E TD-U SU-U VS. .P SB TrenchPipe3 Subdrains. VS.E TD-U SU-U UrbanCurbAndGutterValley1 Urban or residential curbs. It adds no actual geometric data to the assembly. Creates a flat-bottomed valley curb and gutter shape with input parameters for the dimensions. Common Uses General purpose. curbs. General purpose subassembly to add a series of connected links. purpose Ref: D SB ConditionalCutOrFill LinkMulti Medians.E TD-U SU-U VS. SU-G TD-G General purpose. other UD GS irregular structures. Also includes a subbase shape with user-defined subbase slope and extension. Urban or residential curbs. Also includes a subbase shape with userdefined subbase slope and extension.E TD-U SU-U H TD-U SU-U UrbanCurbAndGutterValley3 Similar to UrbanCurbAndGutter-Valley1 except that the bottom is sloped beneath the gutter. UrbanSidewalk Creates a concrete sidewalk at a given cross Urban or residential slope with inside and outside grass sidewalks. OL GS TD-G SU-G LinkOffsetAndElevation Creates a link from the attachment point to a user specified offset (from the baseline) and elevation.

UD GS TD-G SU-G D. Creates a marked point which can be targeted by certain subassemblies.OL. LinkVertical General purpose. LotGrade Creates different lot grading variations based Lot grading. LinkSlopeAndVerticalDeflection Creates a link from the attachment point to a given vertical direction along a given slope. LinkToMarkedPoint Creates a link from the attachment point to a marked point. Creates a link from the attachment point to a given elevation along a given slope. General purpose. on whether the general slope of the lot is up or down. UD GS TD-G SU-G H. General purpose. LinkSlopeToSurface Simple daylighting. LinkSlopesBetweenPoints Creates intersecting links between the attachment point and a marked point.SE. General purpose.OL. Creates a vertical link from the attachment point to a given vertical deflection or profile.V. An optional ditch width can be assigned to create a flat link in the middle. OL.UD. General purpose.V. Creates a link from the attachment point to a given width along a given slope. LinkSlopeToElevation Creates a link from the attachment point to a given surface along a given slope. LinkWidthAndSlope General purpose.SE GS TD-G SU-G H. Ditch between adjacent or merging roadways. General purpose. UD.V GS TD-G SU-G UD GS TD-G SU-G LinkOffsetAndSlope LinkOffsetOnSurface Creates a link from the attachment point to a target surface at a given offset (from the baseline). MarkPoint 21 . OL.SE GS TD-G SU-G H.UD GS TD-G SU-G V. OL. H. UD GS TD-G SU-G UD GS TD-G SU-G SE.V.ROAD DESIGN BASICS WITH AUTOCAD CIVIL 2009 AND AUTOCAD CIVIL 3D 2009 Generic Links and Marked Points Creates a link from the attachment point to a user specified offset (from the baseline) at a given slope.UD GS TD-G SU-G OL.OL. UD GS TD-G SU-G V.OL.D. General purpose.

ROAD DESIGN BASICS WITH ITH AUTOCAD CIVIL 2009 AND AUTOCAD CIVIL 3D 2009 Subassembly Functionality References Ref: H V D E SE VS ES UD MC LM OD OL P Description Responds to width or offset target arget (Widening) Responds to slope or elevation levation target (Independent Profile) Responds to surface target arget (daylighting or matching) Variable pavement course extensions Responds to superelevation Variable subgrade cross slope Subgrade of shoulder is extended to fill slope or ditch slope User-definable definable point. link. Inc. All rights reserved. Autodesk reserves the right to alter prod product uct offerings and specifications at any time without notice. and/or its subsidiaries and/or affiliates in the USA and/or other countries. AutoCAD. and Civil 3D are either registered trademarks or trademarks of Autodesk. Inc. Can use a pipe network twork as a target Subassembly Catalog Section References Ref: CR GS TD-B TD-G TD-M TD-S TD-D TD-L TD-R TD-U GE SU-D SU-L SU-S SU-G SU-M SU-U RE SB Description C3D Imperial/Metric Channel and Retaining Wall Subassembly Catalog C3D Imperial/Metric Getting Started Subassembly Catalog C3D Imperial/Metric Transportation Desig Design Subassembly Catalog – Bridge and Rail C3D Imperial/Metric Transportation Design Subassembly Catalog – Generic C3D Imperial/Metric Transportation Design Subassembly Catalog – Medians C3D Imperial/Metric Transportation Design Subassembly Catalog – Shoulders C3D Imperial/Metric Transportation Design Subassembly Catalog – Daylight C3D Imperial/Metric Transportation Design Subassembly Catalog – Lanes C3D Imperial/Metric Transportation Design Subassembly Catalog – Rehab C3D Imperial/Metric Transportation Design Subassembly Catalog – Urban C3D Imperial/Metric Generic Subassembly Catalog C3D Imperial/Metric Subdivision Roads Subassembly Catalog – Daylight Catalog – Lanes C3D Imperial/Metric Subdivision Roads Subassembly Ca C3D Imperial/Metric Subdivision Roads Subassembly Catalog – Shoulders C3D Imperial/Metric Subdivision Roads Subassembly Catalog – Generic C3D Imperial/Metric Subdivision Roads Subassembly Catalog – Medians C3D Imperial/Metric /Metric Subdivision Roads Subassembly Catalog – Urban C3D Imperial/Metric Rehab Subassembly Catalog Subscription subassemblies Autodesk. or trademarks belong to their respective holders. 22 . and/or shape codes Multiple-course course pavement structure Lining material names and thicknesses can be assigned based o on slope values Final daylight link can be omitted for cases where the corridor needs to be left in an incomplete state. © 2008 Autodesk. Omit link – this feature can be used to create a new attachment point without adding the link to the model. coun All other brand names. product names. and is not responsible for typographical or graphical errors that may appear in this document..