Boris Johnson's Narrow Escape

There may be a measurable reduction in casualties at speedbump sites, but the London Ambulance service claimed that casualties had increased because ambulances could not get people to hospital quickly enough. They were claimed to kill more than they save.
http://www.thisislondon.co.uk/news/article-3091358-details/999+patients+'killed+by+speed+bumps'/article.do
I expect this to be debunked, but if this sort of traffic calming costs any lives then it's the wrong sort.

this is not a debunked, but London held the fastest ambulance service in Europe.