Hmm yeh sounds like bait tactics to me, I've had that once. It was a bike in the wet tailgating me in the back streets, He was sitting about 1m from my rear bumper, I gave a few taps on the brakes and he backed off a little then sure enough came creeping back up. We got to some corners so i sat on 50 which was fine in my car in the wet but the bike had to slow. Then he came roaring back up behind me and pulled me over. Saying u were going a little too fast back there ect ect. I said I wasn't he couldn't prove it, he went with the whole I cbf with paperwork ect ect and rode away.