I'm doing this a lot at the moment... in my new car which I haven't told you about yet, by the way - on my way home from work we have an S bend with a straight leading up to it, then another straight after it, which is all national speed limit, but I'm always getting stuck behind a bus or someone that drives at 40mph everywhere regardless of the posted limit.
But at the moment on the first straight, there's wall strengthening works going on and one lane of traffic is blocked off. Traffic is controlled by temporary traffic lights, but there are no junctions further on for anyone to pull on before or after the lights, so I'm finding myself slowing down to make sure that I'm sat at the red traffic lights with no-one in front of me - opens up a gap in traffic ahead so when the light turns green I can nail it!!! :-D