I was on the M4 motorway a couple of hours ago. Fair bit of traffic, but flowing at 90-100kmh in the 90 zone. I was in the outside lane, with a about an ok (not brilliant) gap to the car in front. There were a few dicks on the road, one came up from the outside lane, i saw inthe mirrors, he cut across 2 lanes, to the inside, then back to the middle, and pretty much couldnt get anywhere as cars were all travelling about the same speed. Now, he is beside me with his move to the middle lane. What would you do at this point ? These were my thoughts of what I could have done A Slow down, so I am not beside him in case he decides to come over B Accelerate so I am in front of him, but then closing the buffer to the car in front C Stay where I am, but be aware of his aggressive driving and have an exit planned? D other_______ I went with C. I could see the way he was driving, so i was aware there was a chance for him to come across - about 15-30 seconds, blinker came on and he started to come across. I was prepared for this, I had seen him head check (obviously a 'didn't see you bro'). So I covered by break when he head checked, and actually dropped back to his rear tyre after the head check, he proceed to come across, I gave the horn a squirt, he pulled back into his lane, arm out the window, to say sorry, and then slowed the Fark down. HE then stayed in his lane till he had to exit. Maybe a bit of a wake up for him. So did I do the right thing? What would of you done?