Cyclist wears a helmet camera to film abusive drivers
1 February 2011 Last updated at 09:03 GMT
Growing numbers of cyclists are arming themselves with a new weapon on the roads - helmet cameras.
London cyclist Ben Porter is one of those to be filming drivers who cut them up or shout abuse.
He explains to BBC Breakfast's Richard Westcott why he took to recording his daily commute, and describes one incident after which the driver was successfully prosecuted for driving without due care and attention.