It's not illegal for me to happen to walk down the street behind you for a couple of blocks; we both happen to be going in the same direction. Same for cars.

It's not illegal for me to happen to walk down the street behind you for a couple of blocks; we both happen to be going in the same direction. Same for cars. What happens if I make the same 20 turns as you, though, at the same intersections, right behind you? At first it was a coincidence, but after a certain number of turns, it's probably not. What if I did this every day for a year? You could probably get a restraining order against me for stalking. But for two turns one day last year? Definitely not. The outward behavior is exactly the same, I just happened to be following behind you (that's what I'll argue). Why should the courts treat a couple of blocks any differently than many miles for many days?