I was cycling home last night and from Bank to Old St Roundabout where there is a set of traffic lights about every 150m.
There was about 3 cyclists in front of me all going reasonably quick so I was quite happy to tuck in behind them. At the second set of red lights where everyone is stopped a lady cycles past all of us and then stops in front of everyone. The lights go green and it turns out she is pretty slow, everyone overtakes her which is a bit of a faff but never mind. Turns out the the next set of lights are red and once again about 50 seconds later she cycles past everyone and stops in front.
I think we hit approximately 5 red lights and she did the same thing every single time. I don't understand the mentality that makes people do this. If someone is faster than you then wait behind them at the lights! It's not a one off either as I've noticed quite a few people seem to feel obliged to push to the front of a stationary set of bikes no matter how slow they are. Surely you must notice the stream of bikes attempting to get around you at every green light or are some people really that oblivious.