Current questions and answers regarding the map editor.

Oh, I used to do this: I would take a bridge and reduce its z-coordinate by a certain number (like 3.3). I'm not sure if this is the most efficient method, but it works. It doesn't work with underground bridges, they seem to be unfinished. However, in the list of objects (available in the advanced editor), there are other underground bridges that work perfectly. You just need to dig around a bit.