Night.icon, perhaps they are doing what some friends and I have done in the dim and distant past, when feeling silly! Overtaking someone and at the same time pointing in the direction of their offside wheel Within a short while they pull in to the side of the road to see what we were pointing at, probably thinking that they have a puncture or something.
Similarly, if you point at, or pretend to look at something in the sky, and there are several people around, you watch to see just how many also look up, to see what the rest of us are pretending to look at.
Maybe that is what they are doing with your car!!