Description
Class G08G : TRAFFIC CONTROL SYSTEMS
Subclass 1/04: Traffic control systems for road vehicles (arrangement of road signs or traffic signals E01F 9/00 ) Detecting movement of traffic to be counted or controlled ( G08G 1/07-G08G 1/14 take precedence; road pricing or congestion charging of vehicles or vehicle users G07B 15/06 ) using optical or ultrasonic detectors