When you are in the road, driving your car, you don't need to rush in and you would probably get in trouble doing this. Actually, there is a speed limit and officers will try to stop you if you exceed the maximum speed limit.
However, that won't be necessary in this game as the idea of this game is to reach the finish line as fast as you can. Your time is short and you can't go slow. There are no power-ups in this game and you will be relying on your driving skill to get to the finish line in the shortest time possible. You have a booster, but using a booster makes it harder to control the wheels.