Handling vehicle collision

[StridBR]

I’m using pointHitTest, each vehicle has 6 points

0 - frontal
1 - back
2- mid-frontal left
3- mid-frontal right
4- mid-back left
5- mid-back right

here’s a sample:

http://www.eab-clan.com/Strid/game.swf

plz help me finding the light !