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I feel that one way systems have a terrifying effect on relative traffic speeds, especially where 'catching' traffic lights seems to cause acceleration.
Burst speeds, yes. There isn't actually a problem with high speeds in London apart from their unevenness. Quite a lot of the time, people are stuck and then they succumb to the illusion that if they really floor it when they see a clear street ahead they'll actually get ahead more quickly. They only end up being stuck in the next queue more quickly, and as they arrive at the back of the queue much more quickly than people can move off at the front, they only exacerbate congestion that way.
A measured response @Oliver Schick, thanks. I can see what you mean about this tight left turning east- to north-bound.
I feel that one way systems have a terrifying effect on relative traffic speeds, especially where 'catching' traffic lights seems to cause acceleration.