Vehicle Noise: Controls Lord GRANVILLE of EYE asked Her Majesty's Government: What arrangements exist to check and control the illegal noise from cars, motor cycles and lorries exhaust systems in the Avon area. The Earl of AVON Day to day enforcement of the regulations affecting vehicle noise is a matter for the police, which, in the County of Avon, is the Avon and Somerset Police Authority. The Department of Transport's vehicle examiners may also cover noise in spot checks of heavy goods vehicles; and silencer and exhaust systems are checked in the annual tests of cars and motorcycles over three years old and of all heavy goods vehicles.