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The Orange Asbo in the fast lane.

DC Peter Grant's car is referred to as "the Asbo" on many occasions. This is a name first given to the Ford Focus ST by television presenter Jeremy Clarkson on BBC television's Top Gear. It derives from ASBO which is an acronym for an Anti-social Behaviour Order. These were a form of punishment used by British courts to combat minor anti-social offences.

The Focus ST is a high performance hatchback, and was sold in a particularly vivid orange colour (as mentioned by DC Grant).[1] Clarkson felt that the car shared some qualities with those individuals at whom the ASBO was aimed, and thus the nickname.

Peter Grant/the Folly also has a blue Asbo.[2]

Which car and of which colour Peter is driving in any one book is somewhat confusing. In timeline order: