In the lecture you never covered what collider you were using for the other scene objects, like the trees and rocks, so I started playing around with the different 2D colliders.
The Square, Circle, and Capsule for the different objects would put too much blank space around most of them and I didn’t want to do the work that a Custom collider requires.
I found that Polygon collider does a very good job of automatically conforming to the shape of all the sprites. For the cars you even get a small bump where the sideview mirrors are located.
Is there any reason, like high overhead for computation, that you shouldn’t use Polygon colliders?