What a strange way to race a car. Your car can change into a bullet and back in a car again. When you come across obstacles like glass gates or wired gates change in a bullet and you fly through. Back to being a car quicly, the more time you spend on the ground the faster you go and only on the ground you can pick up supplies. As bullet you can jump ravines, as car you will just drop dead.
Use the space bar to shape-shift.