Had a k--b in a Honda Accord behind me yesterday on the A50, I was overtaking a stream of trucks and cars at about 75+ish! I couldnt get in for a few hundred yards. He started flashing at me from miles away, then proceeded to sit on my tail. Red rag to a bull...I slowed to 70 and he then started on his horn. He eventually got past to a round of applause from me. He knew I couldnt get over for him, so why the k--b act?
I always use the GPS speed from my satnav, it shows my clock is about 4-5 mph out at 50 so I use it when going through average cams.