Well, I just had a quick look but this:
should NOT be in your main loop. You just declare it ONCE, and it will work until you call clearcollisions or something.
Collisions Player,Obstacle,2,2 Collisions Obstacle,Player,2,2 Collisions Ground,Player,2,3 Collisions Player,Ground,2,3 Collisions Player,Car,2,3 Collisions Car,Player,2,3 Collisions Car,Ground,2,3 Collisions Ground,Car,2,3
should NOT be in your main loop. You just declare it ONCE, and it will work until you call clearcollisions or something.