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Carlo Gavazzi's parking guidance system is a complete solution for guiding drivers directly to free parking bays. Displays with green arrows and digits indicate the direction to drive and show how many parking bays are available in each area. If the area is fully occupied, the display shows red crosses. It is high precision system as each parking bay has an ultrasonic sensor that detects and indicates occupancy. The sensors and displays are linked together via a Dupline® 3-wire.