How to Stop a Car Following You

I've listened to so many scary stories about people being followed and I honestly wasn't going to take any chances. My dad kept an eye on the car and I told him to go straight ahead instead of turning onto our road. We entered another city but we were 10 minutes away from the police station when we decided that it was best to call 911. As I made the phone call, the guy's speeds in front of us and my dad was able to get the guy's license plate. After the whole ordeal they arrested him and told my dad that he could possibly have some mental issues and will be sent to the hospital for further investigation. Until this day no one has ever contacted my dad