Car merging

It's possible to place 2 car spawners so close to each other that when you spawn cars with both of them,
that you will have the cars collide and be stuck in each other.

This can lead to some interesting combinations like a safe transport truck with a roof on the luggage area.
or a multi-colored car with 4 seats.

This hasn't been explored too much since it's a rather obscure glitch.