Joining a 3-lane motorway, two inside lanes crawling because of junctions, outside lane moving freely. So of course I want to get into the outside lane asap. There’s a gap next to me in the middle lane and I indicate to move into it. The car behind the gap sped up to stop me; fortunately for both of us, I always double-check after indicating. Immediately after I moved out behind him, a gap opened up in the outside lane and, as I am now behind him, it catches up to me first.

I gave him a thank you wave as I accelerated past.