Machinery on side of road measuring the vehicle noise.
Brands Hatch, Kent.
Various shots of demonstration on the circuit at Brand's Hatch, with various cars and lorries going past the equipment for measuring the amount of noise they make. The equipment has several microphones and sound recording and measuring machinery. Observers watch and take notes. Various shots of the equipment used out on the A2 road to show how it will be used on the open road.
Date found in the old record - 20/05/1968.