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Average driving speeds in London are already very low. How can they possibly be sufficiently slower as to be noticeable?
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There's no way their slowness is going to make a difference in London. I would have thought the real problem is that they'll just get completely stuck at places where you have to be a bit aggressive to make any progress at all. They don't really have that in America.

That and cyclists/pedestrians can be kind of anywhere at any time. Again not a quite the same in America.

We'll see I guess.

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They get stuck in LA as it is which is pretty chill for a major American city all things considered.

They're just really cautious and do need an extra 10s to think sometimes, and there's a lot of driving scenarios that don't allow that much time to decide to go or not. The biggest culprit seems to be unprotected intersections with the potential for human/bike crossing, which includes driveways which they insist on using for dropoffs (even when they're obviously not public driveways), which they then take a very long time to leave.

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