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Well, I'm not sure I remember this correctly, so would have to chase up the source. Yes, certainly the main cause is following too closely, which is the default in London. And, obviously, those who rear-end someone are pretty much automatically at fault.
If what I remember is right, the difference may be in drivers being able to creep across the give-way line versus drivers coming to a dead stop at a stop line. With the former, close following may be less likely to result in a crash.
I think it's also very much a case of what is established signage. Where you have a lot of 'stops', as in the US, it's more expected and drivers probably take appropriate care. Over here, I think it would take a long time to change driver behaviour to get them used to 'stop' signs.
Really? I would think rear end crashes would be mostly down to following too closely, whether at Yields, Stops or just generally in traffic.