Hi
I have tested new version (2010-06-30) of vdrift on FreeBSD/amd64. I made some minor modifications for it builded without problems.
The problem is when I play some race it seems like collision is working partially because some areas (almost all) of some tracks can be trasppassing (cars, walls, etc). Another times the cars are keeping trapped on some walls when I try pass them.
See some screenshots at:
http://people.freebsd.org/~acm/screen/vdrift
Maybe it could be by the latest version of bullet (2.77) that I'm using on my fbsd box.
Tell me what kind of information could help you for fix it.
Greetings
ACM