Civil 3D: Targets Without Targets!

Do you use targets to modify the width of a lane or sidewalk? Would you like to vary a daylight slope over a station range? Are you looking for a different way to handle driveway curb letdowns? If you said yes to any of these, the 23.2 update for Civil 3D has a new feature that can help. Read on.

You probably know that geometry can be drawn, a polyline or alignment, and then defined as a target to change the width of a lane or sidewalk.

This works well, but there is a new option now. It’s called Corridor Transitions. Essentially, you can get the same result, but instead of drawing that geometry, the widths can be defined in a tabular format.

1. Select a corridor and choose Edit Corridor Transitions in the ribbon.
2. Enter values in the panorama that define the transition you need.
3. Click Apply.

Here, the width parameter of the LaneSuperelevationAOR is being controlled by the values in yellow. There are 3 stations ranges that define where and how the transition happens. Also, the DaylightMultiIntercept slope parameter is being controlled by the values in green. It transitions from a 2:1 slope to a 1:1 slope between 4+80 to 5+60, then there are 2 other transition regions after that.

To define a driveway curb letdown, use the same procedure, except that the subassembly parameter that is varied would be the curb height. 3 transition regions will define a single letdown.

• From 0.75 to 0.1
• From 0.1 to 0.1
• From 0.1 to 0.75

Enjoy!