Have a look at the car/driver example included in the b3d samples. I think it contains the system you are looking for.
From your collision layout above i dont understand why the cars are colliding with each other as you would need to add "collisions 1,1.." to do that. Are you sure the cars are working and you have an updateworld in the loop?
From your collision layout above i dont understand why the cars are colliding with each other as you would need to add "collisions 1,1.." to do that. Are you sure the cars are working and you have an updateworld in the loop?