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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

provides civil engineers. To create a corridor. local roads. technicians. 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. The corridor model serves as the “backbone” of the design and from it many useful forms of information can be derived. made up of AutoCAD Civil 2009 software and AutoCAD Civil 3D 2009 software. designers. the focus will be on utilizing corridor models for road design exclusively. Similar points on the assembly insertions are connected using corridor feature lines—establishing the edges of the 3D model in the longitudinal direction. The assembly. which represents the cross-sectional shape of the road. and surveyors with targeted solutions for a broad range of project types. Lastly. and environmental. 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. For example. In this document. 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).ROAD DESIGN BASICS WITH AUTOCAD CIVIL 2009 AND AUTOCAD CIVIL 3D 2009 Introduction The Autodesk civil engineering solution. This paper explores the definitions and terminologies behind points. Figure 1. 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. including land development. The corridor can be shown in cross section views and earthwork and material volumes can be 3 . and channels. The Corridor Model Corridors are arguably the most powerful and sophisticated objects in AutoCAD Civil 2009 and AutoCAD Civil 3D 2009. an alignment. and assembly are combined to form a 3-dimensional representation of a linear feature such as a road or channel. drafters. is inserted along this 3D path at user-specified increments. 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. surfaces can be derived from the corridor representing finished ground or any number of underlying surfaces. A 3D Chain represents an alignment and profile which control the horizontal and vertical aspects of the road. An assembly is then inserted along this path at user-defined increments and is connected longitudinally by corridor feature lines. transportation. highway design.

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

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

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

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

And finally. As the alignment moves away from the road centerline. utilize target parameters. the subassembly widens to create the additional lane. ditches and berms. a target surface of EG has been assigned to the DaylightMaxWidth subassembly within the corridor. Unlike daylighting methods. For instance. Figure 15 shows the final result when this approach is used. Other daylight subassemblies can automatically create benches. it is possible to use the grading creation tools in AutoCAD Civil 3D 2009 to project slopes from a corridor feature line. for example. Figure 13 shows how AutoCAD Civil 3D can automatically calculate the solution between the corridor daylighting and the pond daylighting. is often used in the area between a ramp and highway as the two merge. The table in the Appendix shows a complete list of the daylighting subassemblies that are available and some of their more common uses. Slope or elevation targets can be utilized for some assemblies to control the vertical aspect of the corridor geometry. or survey figures as targets to control the shape of the corridor. 8 . can be accomplished by using the BasicLaneTransition subassembly along with an alignment target representing the edge of the travel way. 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. profiles. In order for a daylight subassembly to function properly. This subassembly will seek out a marked point on the ramp and automatically create a swale between the two roadways. feature lines. Figure 15. As shown in the Figure 14. 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. This is made possible through the use of grading projection from a feature line that is dynamically linked to the corridor. certain subassemblies can target a marked point. 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. Instead of using a daylight subassembly. 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). Part of the process of constructing the corridor model is to assign the Figure 14. Daylighting can also be accomplished through feature lines and grading projections. Specific subassemblies can use alignments. Other subassemblies utilize width or offset target parameters to change shape as they progress through the corridor. Superelevation parameters can be found by accessing the alignment properties and clicking the Superelevation tab. Superelevation Many subassemblies have the capability of responding to superelevation parameters. LinkBetweenPoints for instance. a target surface actual targets for subassemblies that is assigned within the corridor properties. For example. A turning lane. polylines.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. allowing them to seek out a specific location on another subassembly and connect to it. grading projections can clean up on each other and provide easy solutions for complex designs. 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. and/or adjust slope depending on the material being excavated. This can be especially advantageous when slope projections need to be perpendicular to a feature of the road rather than the centerline. Figure 13.

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

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. links. it provides engineers with a valuable resource for creating compelling designs for years to come. annotating. 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.ROAD DESIGN BASICS WITH AUTOCAD CIVIL 2009 AND AUTOCAD CIVIL 3D 2009 Conclusion The AutoCAD Civil 3D 2009 corridor model can make building. 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. and analyzing your road design more efficient—especially when all of the benefits of subassemblies are leveraged. In addition. shape codes and target parameters. you will be able to construct more effective corridor models more efficiently. by leveraging points. 10 . 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. By thoroughly understanding the subassemblies and their functions.

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

direction TD-L SU-L Lane that responds to Inside Lane superelevation value. SE. Lane that responds to Outside Lane superelevation value. lanes LaneOutsideSuper LaneOutsideSuperLayerVaryingWidth Pavement structures requiring more than four courses with varying widths. crown needs to be controlled independently.V. 12 .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. SE.SE UD TD-L SU-L H.V.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. The meaning of the codes in the Ref column can be found at the end of the appendix. superelevation H. Up to 10 different courses can be specified. CrownedLane GenericPavementStructure H. SE.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.MC TD-L LaneInsideSuper LaneInsideSuperLayerVaryingWidth Lane that responds to Inside Lane superelevation value and allows independent widths for each pavement course.VS. direction Medians with left turn lanes. SE. LaneFromTaperedMedian2 Similar to LaneFromTaperedMedian1 except Medians with left turn H.MC median. SE.MC TD-L SU-L H. four courses. independently A simple pavement structure with userdefinable point. LaneFromTaperedMedian1 Maintains the cross slope of the lane while extending it inward to create a left turn lane. in one travel direction.V. Lane that responds to Outside Lane superelevation value and allows independent widths for each pavement course. and shape codes. VS TD-L H. link. Up to 10 different courses can be specified. SE. Works in conjunction with an alignment defining the median edge.V.V. Pavement structures requiring more than four courses with varying widths.MC TD-L H.MC TD-L H. SE. SE. Multi-lane lane roads with superelevation. LaneInsideSuperMultiLayer Similar to LaneInsideSuper except that there Pavement structures requiring more than are additional available pavement courses.V. Highway Design (New Construction): Lanes Image Name Description Common Uses Ref: H.MC. Highways with multiple lanes in one travel direction.MC TD-L H.V.V.V. All road lanes. Each subassembly is listed with a brief description and one or more common uses. Any pavement course.V. that it allows for two lanes outside the lanes – multiple lanes SE. This subassembly is commonly used for general-purpose lane creation.

MC TD-L of the curve and the length of the wheelbase.MC TD-L H. MedianRaisedWithCrown SE TD-M SU-M 13 . Generic shape with user-defined geometry and codes. Similar to MedianRaisedConstantSlope except that the median cap is crowned by applying slope values either manually or through superelevation. SE. Pavement structures requiring more than four courses. Creates a median that is flush with adjacent lanes and can include an optional jersey barrier. Subsurface courses that can be set to match the structure of abutting lanes. VS TD-L LaneOutsideSuperWithWidening Automatically widens lane in superelevated Highways where lane H.E. Multi-lane roads with superelevation. MC TD-M SU-M TD-M SU-M MedianRaisedConstantSlope Divided roads or highways where curbs define the edges of the median. The cross slope of the top of the median is constant at a given section. 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. Divided roads or highways requiring a depressed median. Depressed median between an attachment point and marked point with various parameters to control ditch geometry. H.UD TD-L SU-L LaneTowardCrown ShapeTrapezoidal Irregular-shaped pavement courses and other structures. Divided roads or highways requiring a depressed median. 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. VS TD-M SU-M TD-M SU-M MedianConstantSlopeWithBarrier MedianDepressed MedianDepressedShoulderExt H.MC.SE.VS. Similar to MedianDepressedShoulderExt except that shoulder termination is vertical rather than extending under the ditch slope. SE.V.SE.V. VS TD-M MedianDepressedShoulderVert MedianFlushWithBarrier Divided roads or highways. Common Uses Divided roads or highways where asymmetrical barriers are needed.ES TD-M H. Creates a cap for a raised median between the attachment point and a marked point.V. regions using a formula based on the radius widening is required SE. Ref: H.V.V. SE. Divided roads or highways where curbs define the edges of the median.E. H. There is also a parameter to incorporate interior turn lanes.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.V. SE. Divided roads or highways requiring a depressed median. Depressed Median with various options for superelevation rotation and subgrade extension. H.V. when in superelevation. SE.

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

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

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

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

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

The gutter slope can also be set. Simple rectangular sidewalk section with optional buffer areas on either side. Simple rectangular curb. design GS Simple guardrail structure. BasicGuardrail Any road design. Creates a simple parabolic shape where the crown height. OD GS BasicSidewalk Residential and urban GS roads with sidewalks. and slope can be adjusted. design GS BasicLaneTransition Simple lane in which the width and outside elevation can be controlled through target parameters. It is a “rigid” shape with no target parameters. adjusted in size and shape through a number traffic control during of parameters. It is a “rigid” shape with no target parameters. Daylighting that creates an optional flat or vshaped ditch in a cut condition and a simple fill slope in a fill condition.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. GS BasicCurbAndGutter LaneParabolic Any road design where parabolic arabolic lane is required. Turning lanes. excavation TrenchPipe2 D.LM. A simple lane with no subsurface courses. TD-L SU-L GS BasicLane BasicShoulder GS Any road design where there is a constant shoulder width and no material volumes are needed. Width of the trench is determined by a user-specified width and minimum pipe cover. It is a “rigid” shape with no target parameters. Available parameters control width. and slope. A simple shoulder with no subsurface courses. Builds trench around one or two pipe networks. depth. construction. and slope. Available parameters control width. Pipeline excavation. BasicCurb All road and parking lot curbing. A simple curb and gutter in which the height and width of the curb and gutter can be adjusted through a number of parameters.P SB 19 . width. daylighting BasicSideSlopeCutDitch D. Any road design where there is a constant lane width and no material volumes are needed. Slope is calculated using a “string line” attached to left ETW and right ETW. lanes H. depth. excavation D TD-U SU-U Pipeline excavation. Any road design.V GS Simple daylighting. 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.

E TD-U SU-U H TD-U SU-U UrbanCurbAndGutterValley3 Similar to UrbanCurbAndGutter-Valley1 except that the bottom is sloped beneath the gutter. Creates a standard curb and gutter shape with input parameters for the dimensions. Offset and elevation can be controlled by target parameters. purpose H. Similar to UrbanCurbAndGutter-Valley1 except that the bottom is sloped. 20 . Common Uses General purpose. curbs.V. The vertical placement of the trench is set at the attachment point and the depth can be entered manually or controlled by a profile. Urban or residential curbs.E TD-U SU-U VS.E TD-U SU-U VS.UD. Creates a flat-bottomed valley curb and gutter shape with input parameters for the dimensions. Also includes a subbase shape with userdefined subbase slope and extension. purpose Ref: D SB ConditionalCutOrFill LinkMulti Medians. boulevards. UrbanCurbAndGutterValley2 Urban or residential curbs. SU-G TD-G General purpose. VS. UrbanSidewalk Creates a concrete sidewalk at a given cross Urban or residential slope with inside and outside grass sidewalks.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. OL GS TD-G SU-G LinkOffsetAndElevation Creates a link from the attachment point to a user specified offset (from the baseline) and elevation. excavation D. It adds no actual geometric data to the assembly. then becomes flat beneath the curb. Creates a stone-filled drain structure with a circular pipe inside. General purpose subassembly to add a series of connected links.P SB TrenchPipe3 Subdrains. 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. Subdrains TrenchWithPipe V TD-U SU-U UrbanCurbAndGutterGeneral Urban or residential curbs. VS. other UD GS irregular structures.E TD-U SU-U UrbanCurbAndGutterValley1 Urban or residential curbs. Also includes a subbase shape with user-defined subbase slope and extension. Pipeline excavation. .

General purpose. LinkSlopeToElevation Creates a link from the attachment point to a given surface along a given slope. UD GS TD-G SU-G H. General purpose. UD. LinkSlopesBetweenPoints Creates intersecting links between the attachment point and a marked point. Creates a link from the attachment point to a given width along a given slope.SE GS TD-G SU-G H. LinkSlopeToSurface Simple daylighting. General purpose. UD GS TD-G SU-G V. Creates a link from the attachment point to a given elevation along a given slope. Creates a marked point which can be targeted by certain subassemblies. Creates a vertical link from the attachment point to a given vertical deflection or profile.OL.UD GS TD-G SU-G V.D.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). Ditch between adjacent or merging roadways. LinkVertical General purpose.UD GS TD-G SU-G D.UD. LinkWidthAndSlope General purpose. UD GS TD-G SU-G UD GS TD-G SU-G SE. General purpose. An optional ditch width can be assigned to create a flat link in the middle. OL.OL.V. OL. MarkPoint 21 . General purpose. on whether the general slope of the lot is up or down.OL. H.V.OL. OL. LinkSlopeAndVerticalDeflection Creates a link from the attachment point to a given vertical direction along a given slope.SE.UD GS TD-G SU-G OL. LotGrade Creates different lot grading variations based Lot grading. LinkToMarkedPoint Creates a link from the attachment point to a marked point. General purpose.SE GS TD-G SU-G H.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.V.

or trademarks belong to their respective holders.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. 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. Autodesk reserves the right to alter prod product uct offerings and specifications at any time without notice. © 2008 Autodesk. 22 . All rights reserved. link. coun All other brand names. and/or its subsidiaries and/or affiliates in the USA and/or other countries. AutoCAD. Inc. 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. Omit link – this feature can be used to create a new attachment point without adding the link to the model.. Inc. and Civil 3D are either registered trademarks or trademarks of Autodesk. and is not responsible for typographical or graphical errors that may appear in this document. product names.