Congratulations! SF Rush is arguably the worst Playstation racing game ever made!
Everything about this game screams bad: graphics, collision detection, course design, sense of speed (or lack thereof), but mainly the collision detection. Good lord I actually drove thru an opponent at one point in a race, while on another corner i nicked a barrier and my car flew off the track.
This sort of exceptionally horrible design is inexcusable. The development team here should be banned from ever producing another title.