Talking roadside electronic equipment talks to drivers through car radio.
Car coming along open road and passing camera then again but this time stops next to small roadside unit. Various shots of small unit at roadside with an amplifier and tape recorder next to it. Driving information is gathered electronically and tape recorder gives instructions to drivers through a wire running across road. Special car radio delivers it to driver. Various travelling shots in car driving along road, radio set in car is switched on to receive signals from talking road signs. Various shots of man stepping out of car and walking on wires with small portable induction coil and transistorised amplifier.
Date found in the old record - 24/07/1963.