• If you're in the primary position, it's inevitable that people undertake you, especially if you're stopped somewhere. Many people aren't used to overtaking another cyclist that far out. This is why you should check on your left in certain situations, e.g. when turning left.

    As long as people don't get too close, I don't tend to have an issue with it, and, apart from at lights, it's only happened to me once or twice--once, I was undertaken by a total idiot when I was effectively in the secondary position and slowing down for the traffic lights at Holborn Circus. After having words, I then rode away from him across the junction and aimed to stop shortly afterwards at a shop there. I signalled, slowed down again and moved from the primary position towards the kerb, but without checking behind me, only for him to suddenly undertake me again, having clearly tried to catch up, with millimetres to spare. That manoeuvre was certainly too stupid for me to anticipate.

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