A good reason for bicycles to have registration plates.

http://www.thisisbath.co.uk/Road-rag...ail/story.html

A cyclist ripped off a car wing mirror in a fit of road rage during an
incident in Bath.

Police are appealing for witnesses to the altercation, which took place
outside the Weston pub just after 11am on Monday, March 12.

The driver of a Ford Fusion beeped his horn at the cyclist as they
approached the traffic lights, who ripped off the passenger side mirror and
rode off along Newbridge Road.

He is described as white, in his late teens or early 20s, about 5ft 10in
tall, and slim with dark hair.