A lot of items have type "passable" where they should not. Most of cars. Some chinook parts, etc.
To be more precise they have walltype="none" parameter set, when it should be "tall".
You can fix it manually in xml files.
One car red_van_NE, i think it was, has wrong PNG also. It is original model file 2000x2000, but game only accepts 200x200 versions.