A couple of things: 1. Some of the edges on each track are not smooth. Imagine if there's a choke point where everyone has to bump to each other. If your car hits an edge that has either a space or a dent on it, then good luck. 2. The RESTART function does not put you on a safe side of the track. Imagine if your car falls or if you have to manually restart. The game will put you near to where you fell off. After the restart, if you are mindful enough, you have a split second to change directions