Every two hours someone dies on the road; every two minutes someone is injured. These are shocking figures - or they should be. But we seem to accept 5,000 road deaths every year, while we are horrified by other transport disasters with much less loss of life, like Clapham or Lockerbie. The real tragedy is that most road casualties need not happen.

Technology, engineering and enforcement of the law could cut the carnage. Why are they not being used?

Horizon investigates a story of delay, complacency and bureaucratic muddle.

Transcript: send a cheque for £1.75 to [address removed]
(Ceefax subtitles)