Fred Harris and Lesley Judd look at the increasing use of computers in cars and show how the Rover Sterling uses a micro to control everything from its fuel supply to its anti-lock braking. With so many electronic devices appearing in some cars the manufacturers are looking for other solutions to the problem of how to connect the electrics together. On the racing circuit, Tyrrell cars demonstrate how higher speeds are achieved by designing their cars on computer. And from America, Freff reports on ETAK, a remarkable car navigation system which shows a driver exactly where he is on a street plan which moves in front of his eyes on a screen as the car moves along the road. Also from the States, a simple touch screen which will do away with most of the levers and knobs which hang off a car's dashboard.