Very very early demo video of the work in progress Zombie Race terrain engine. The terrain is image based, so it's easy to create levels. This could possibly also allow user created content without the need to make special level making tools.
Excuse my crude programmer art used as a placeholder here. For those that are wondering, the circles you see are the raw collision shapes used by the chassis and wheels by the physics engine. We are using the in house developed Chipmunk Physics engine that has found it's way into many iPhone games.