Civil 3D Corridor Transitions

 Civil 3D now has added controls for transitioning subassembly parameter values across a defined station range. This allows for greater flexibility in modelling complex roadway features and saves time setting up target linework, separate regions, and multiple assemblies.

You can also create linear, slope, and elevation transitions on corridor feature lines which reduces the need for complex, custom subassemblies.

Some of the top use cases include:

• Daylight slope transitions
• ADA ramps and driveways
• Bus bays
• Turn lanes

To create corridor transitions, first, select the corridor.

On the ribbon, on the Modify Corridor panel, select Edit Corridor Transition.

If the corridor has multiple baselines, you are prompted to select a baseline. Select the baseline in the corridor to which you want to add the transition. This may be an alignment or a feature line.

The Corridor Transition Panorama vista is displayed, and a prompt is displayed at the command line to select the subassembly to transition.

Hover over your corridor, on the subassembly you want to transition, and select it on the screen. After you select the subassembly, a list of available parameters in the subassembly that you can transition is displayed.

Select the parameter to transition from the list.

Select the start station of the transition.

Enter the parameter value at the start station. The default value is displayed in Panorama Vista.

Select the end station of the transition.

Enter the parameter value at the end station.

Specify the transition type.

If needed, continue to specify transition information by specifying the end station for the next transition. In this example, I’ve transitioned for a drive access by removing the curb and gutter back. Once completed, select Apply from the top right of the panorama.

NOTE: You can copy and paste transition sets to the same corridor, a different corridor, or a corridor in another drawing. In the Corridor Transition Panorama vista, right-click a transition or a transition set to access the copy and paste commands.