Trant said...Gorgo said...
So what's happening? Apart from a total numpty nobody drives that slow just for the hell of it. What is causing the slow speeds?
You just reminded me of an old New Science video where they demonstrate that phenomena
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I can tell you from practice that people hate it when you leave enough space to prevent these sort of waves happening

When I used to drive home from the city I used to leave at least 3 or more car lengths in front of me and often the poor sucker behind me would get pretty steamed up and do whatever it took to get past me... only to find out that the traffic in front of me has stopped.
I think I stumbled across this on a website and I think it was 'traffic wave theory' or something like that. It works, but it does upset a few people around you.
The worst is when there is an accident and people slow down to rubber-neck, and even hours after the accident, the standing-wave in the traffic is still causing the slow down at that point. The counter-intuitive way to fix it is to slow down well before that point and gradually speed up to the desired speed. Of course, everyone else thinks the way to fix it is to drive up fast to the car in front and then brake... which reinforces the standing-wave.