Bad night tonight, on the usual drive London to Bedford so M11, M25, M1.
Someone joining the M1 via lane merges, so I moved over to lane 2. They indicated and then pulled into lane 1 leaving them behind a lorry. I was going 5-10mph faster than them so didn't worry about moving further over - they finished pulling in and immediately carried on into my lane despite me being bang on level with them by this point. Must have assumed there was no one else using the road aside from the lorry maybe. I was braking hard by the time they'd committed to the move, so my bumper lining up to hit their rear corner when I put the horn on too. They carried on pulling out and drove off mildly faster and blinked their hazards. TBH it was such a close one I assumed they thought "**** him I'm pulling out", but maybe they just did not look at all.
Then later on went to pass someone dawdling in lane 2 and as I regained the speed I'd lost while they were in front of me slowing down, they drifted about 2-3 feet into my lane (3). That time I didn't bother with the horn and just held back as earlier incident was a bit close for comfort despite being well under control.
Plus the usual, someone doing 50mph in lane 3 of a 4 lane motorway so I pass them at my ideal 55 in lane 1, or someone pootling at 49mph in lane 1 and I go to pass them in lane 2 and they speed up til I can't pass. Just tons of people not paying any attention at all.