Control and alarm device for road and motorway accesses by vehicles moving in wrong direction comprises two traffic direction sensors and one or more signaling, twin-faced illuminated signaling panels, fed by mains current or solar panels

摘要

The control and alarm device for road and motorway accesses by vehicles moving in the wrong direction comprises two traffic direction sensors and one or more signaling, twin-faced illuminated signaling panels, fed by mains current or solar panels. It can be supplemented by a radio transmitter of encoded signals. The traffic direction sensors can consist of two photo-electric cells, pressure sensors positioned on the actual road surface, or heat sensors located on the road surface.