Development of Auto Measuring System on Tred and Contact Pressure of Traffic Wheels

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The auto measuring system which can automatically and continously moniters the traffic flows and loads has been developed. Its system consists of three subsystems as follows,(1) Switch senser mat : The switch mat is 800x7x7200mm flexible rubber mat. The switch sensors consists of two groupes;the main switch and the trigger switch. This mat is rested on the road covering the lanes and fixed to the road surface with cohiesive tape.Vehicle wheels push the trigger and main switchs.(2) Data logging box : Data logging box has its ROM and RAM ,timer. The on-off bits of 72 main switches and times when the wheels push the trigger switches store to RAM. After memory full,these data in RAM are sent to extra memory device with RS-232C or GPIB interface.(3) Data processing : Data in extra memory device are processed by microcomputer. The present soft-wears can display some distribution graphs of traffic volume of each vehicle type,moving speed,headway,spacing,center of vehicles and lateral position of wheels on CRT or printer.This system can be used to automatical,long-time,easy measurements and these equipmets are very portable.