So you work under a highway huh, little wine and weed and a tent and some panhandling ?
I was going to suggest if you build stuff like that you might try UT2004, it seems more accurate and less crashy. I found too if you convert the brush to a mesh, then reconvert back to a brush, then export it cleans up some things in the brush (as one solid brush)
I actually work as a Firefighter
we were testing a new sea water pump the city aquired for us in a marina and that's were I saw the brigde.
It is an Idea going to 2k4, but I think the next game/engine will learn is going to be Source making HL2 maps. I'm gonna stick testing the limits and tricking UT99
this is like Silver said, thought to be placed in a closed area, middle of the city (buildings are basicaly cubes) or a small marina (with simple terrain/ water)@Silver:
I think a DOM map would be better