3-D car game - hitTest

Hi everyone,
kinda new to the game making side of Flash, and am working on a game project for college. I want to create a car game using a 1st person perspective, as opposed to the ‘view from above’ one.
I have used the 3D tutorials on this site, and have a basic model set up.
However, I’m not sure whether I can make collision detection work.
Would hitTest work considering the camera object doesnt really have any width or height properties?
Thanks for your time