SYSTEM FOR DETECTING VEHICLES ON LANE IN ZONE OF AUTOMATIC BLOCKING DEVICES Russian patent published in 2000 - IPC

FIELD: roadway facilities. SUBSTANCE: system has more than one converter installed on roadway shoulders and connected to control unit of blocking devices. Piezoelectric converters consists of at least two layers glue together. Inner layer is made of piezoceramics and outer layer, of metal with low thermal expansion coefficient in range of temperatures from -50 to +50 C and featuring high chemical resistance. Vanadium, molybdenum, titanium or its alloys are used in making of second layer. Converters are orientated so that generated and reflected vibrations pass in parallel with roadway pavement at height providing definite recording of vehicle. EFFECT: provision of accurate detection of vehicles on lane in zone of automatic blocking devices. 1 dwg