A clean, unmodded copy of TDU (preferably the 1.66A version).
Some users report that while 60 FPS is the standard "safe" zone, capping the game at Test Drive Unlimited Invisible Police Cars Fix
: Taxi and hitchhiker missions will no longer end abruptly because you hit an invisible obstacle. A clean, unmodded copy of TDU (preferably the 1
: The game was originally optimized for a maximum of 90 FPS. Test Drive Unlimited Invisible Police Cars Fix