With every new release of Civil 3D, their corridor feature improves. It’s great for building roads that are constructed with a centerline top of pavement profile. But what happens when you work in a municipality that dictates that all roads be built with a top of curb profile, like in most of the Dallas-Fort Worth area? Well…even though Civil 3D corridors are designed to build from the middle out with a centerline profile, we can actually do this with a little outside the box “CADDING”.
Let’s take a typical 24’ road for example.
If you were going to building it with a CENTERLINE TOP OF PAVEMENT profile it would look like so:
Pretty standard, right? Well, if you needed to build a corridor with a TOP OF CURB profile, it would look like so:
The biggest difference is that we are using the generic LINKWIDTHANDSLOPE subassembly to set our connection points to the back of curb and then adding the appropriate subassemblies from there. And to make sure that those extra links don’t generate a surface, we just erase the link and point codes in the subassembly properties. Just set the elevation targets on those “dummy” links to your TOP OF CURB profile and you got yourself a road modeled from the outside in. No more sampled profiles and manually labeling those profiles!