The first point is to stay calm. You’re in your car, and they are in theirs, and as long as it stays that way you are safe, even if you do feel scared and uncomfortable. So, if your doors aren’t already locked, now would be a great time to activate the central locking button before continuing to drive carefully; it is very easy to focus all your attention in the rear-view mirror, leaving yourself dangerously distracted and neglecting what’s happening on the road in front of you.