A device suitable autovehiculos issuing an acoustic warning of braking or stop it follows.

摘要

1296871 Road traffic signals on vehicles M MAINI 19 March 1970 [21 Oct 1969] 13191/70 Heading G4Q A radio transmitter is mounted on a vehicle for transmitting an audible signal to a following vehicle to warn of braking and stopping. The transmitter is connected to a directive transmitting aerial at the rear of the vehicle. A radio receiver is also provided, connected to a receiver aerial at the front of the vehicle. An intermittent audible signal warns that the vehicle in front is braking, and a continuous signal that it has stopped.