Was travelling south along the M1 from the Gateway Bridge to the Pacific Highway. Three lanes, I was in the middle sitting behind two cars that were travelling at approx 80kms in a 100 zone. No issues with that, so I merged to the right lane moved past the cars and back into the gap between the front white car and another car that was about 30m ahead of me. Zone changes from 100 to 80 and I off-throttle and forget to touch the brack, relying on the twin GS to do its engine braking gorgeousness. Next moment the white car behind me is right on my ass, and I mean within spitting distance. Ease back onto the throttle and pull forwards, now just waiting for the Pacific Highway merge. As I approach the merge the car behind cuts between me and the car to his left (I am in the middle lane merging into the off ramp right lane.) He is literally so close that I can touch his side mirror. The driver is flailing his hands at me wildly. I open throttle and move well in front of him. What follows is a strange game of Car Chase Bike as I merge between cars with him following sverving into gaps to try and keep pace with me. I merge to the left lane, he speeds into the right and comes up alongside my right and proceeds to scream and gesture at me. Cant hear a word which I do my best to convey to him. Driver moves his car in front of mine and astutely assumes I am going to take the next exit. He bides his time and at the last moment crosses the white hatching and up the left ramp. I merge back off the ramp and onto the motorway. Again with the shouting and gesturing. One thing I didnt understand was: he kept pointing at me and then at his shoulder, which I think meant that he was referring to the badges on my jacket. Possibly assuming that RST is some outlaw bikie gang logo. Whole event had me pumped with adrenalin and I still dont know what I did to bring on this guys spectacular tanty.