Vehicle weight surveys and in-motion weighing



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The need for vehicle weight data in planning and designing highway facilities has historically been satisfied by stopping selected vehicles at specially prepared roadside sites and weighing each wheel of the vehicle on portable scales. This survey technique has been an expense and a safety hazard both to the surveying agency and to the road users. A recently developed system for weighing highway vehicles in-motion eliminates all user costs and reduces many of the traffic hazards and personnel expenses which have previously been inherent in static weight surveys. Field tests of the in-motion weighing system indicate that accuracy comparable to that of conventional static wheel weighing devices is feasible. A revised vehicle weight sampling program, which incorporates in-motion weighing, has been designed for the State of Texas. Included in the design of the new program is an evaluation of the number of necessary survey sites, sample sizes, and a study of timewise variations in vehicle weights. The economic effects of utilizing conventional static or in-motion weighing techniques, in the new program, are analyzed through a comparative cost analysis