[EricH]

Originally Posted by grstex

A separate issue to consider: what will it be like driving over the drawbridge if a boulder is stuck underneath it? And, how about could you get high centered driving over the moat if a boulder is inside of it?

You'll want to build a robot and the obstacles in question and try it.

That being said, I'd anticipate the boulder exiting the moat on contact; the drawbridge might be a little more interesting.