Question about OCD tendency?

Think realistically. Running over someone produces a HUGE noticeable bump. You may even lose control of your car if your wheels munch over a body. The front of your car would be covered in blood and badly dented. There would be blood on your wheels, cars behind you would put on their brakes, there would be screaming, you might even get a knock from a policeman the next day. In all likelihood you've got less than a 1 percent chance to hit someone per day. Most people go their whole lives without ever hitting a pedestrian. There are things in place to prevent it. It's hugely unlikely you will ever hit someone. Relax a bit.