I'm sorry to disappoint you but I don't do any collision detection, because:
(a) I don't trust c_move's collisions either,
(b) it would look ugly to have cars climbing the pavements in order to pass by each other (road is quite narrow, should have known better... )

Instead, cars use c_scan. Can't you tell from the distance they start to dissolve?

Of course, I could make many things different (and less ridiculous) if I had more time. But this game's main goal is to have a good friendly & enemy AI and that was where most of the development time was spent.

Hopefully there will be a patch coming out soon.