I had a similar incident a while ago on the M1.
Weekend so not busy.
Slow car in lane 1
I came up behind (at 70 in the Morgan).
Looked in the mirror - in the distance in lane 3 (for no reason) was a GTI Golf doing a loonatic speed.
He was not indicating.
So I indicated and pulled into lane 2.
We were on top of the next junction and what I couldn't know was that he was intending to go off there, so he came past at at least 90, with his horn blaring, then cut sharply across and just made the sliproad.
Hopefully the speed cameras got him on the way.
A while back I, in the Morgan, had a white van man pass on the inside of a bicycle that I was passing, and clearly indicating my intention to enter the on ramp of the Autostrada. A very dangerous manoeuvre as there was not much space between the bicycle (obviously going straight on and not entering the Autostrada) and the guard rail. As we entered the Autostrada I moved to the middle of the three lanes and outaccelerated him up to 130 kph. At that point I was slowly overhauling a slower vehicle in lane one. WVM came up alongside me in lane one and up to the bumper of the car I was about to pass, looked me square in the eye and then pulled across on me. Fortunately I had space to move across a little and brake hard, missing a collision by mere centimetres. WVM then continued to accelerate, I'm guessing to about 160 kph, and disappeared over the horizon. I don't know what drugs he was on but I sure hope he only hurts himself when he finally stuffs it into something.