Cycle campaigning

Believe me, London drivers are not uniquely aggressive. The new ASSET cameras detect tailgating and other dodgy behaviour:

http://cars.uk.msn.com/news/articles.aspx?cp-documentid=155191051

And it has been tried in London:

A review of 20 mph zones in London found that there was an average reduction in casualties of 42%, compared with an 8% reduction in surrounding areas. Although injuries amongst cyclists reduced at a lower rate than other users (only 17%), this does not take account of the fact that cycling levels increased much more than for other modes.

http://www.ctc.org.uk/DesktopDefault.aspx?TabID=5176

Speed bumps are claimed to cost far more lives than they save. These are hardly impartial sources, but neither is the CTC.

http://www.thisislondon.co.uk/news/article-3091358-999-patients-killed-by-speed-bumps.do
http://www.bromleytransport.org.uk/Ambulance_delays.htm

http://www.belchamber.org/speedhumps/SpeedHumpsAmbex03.ppt

In addition the proliferation of speed humps is responsible for the proliferation of large gas guzzling 4x4s, when London used to be full of Minis and superminis.