The design of roadways is typically based on the development of an alignment, then a profile, and finally a typical section. Many users who design intersections, ramps, or widenings run into difficulties because the process in AutoCAD Civil 3D software assumes that the road edge profile is designed independently of the two centerlines. In this class, you will learn a technique that allows the use of the classic alignment–profile–section process to design a widening, a ramp, or the turning lanes of an intersection. This technique can be used for all types of corridors where the pavement edge elevations are to be controlled by a specified crossfall from another profile or surface.
- Build assemblies for the design of ramps that transition from another lane edge through a gore to an independent lane
- Put all of the pieces together in a corridor model
- Use crossfall and superelevation parameters in the design of curb returns
- Build assemblies that allow the user to match a lane widening to an existing surface and crossfall