Abstract
Roads and bridges are designed to meet the transportation demands for traffic volume and loading. Knowledge of the actual traffic is needed for a rational management of highway infrastructure. There are various procedures and equipment for measuring truck weight, including static and in weigh-in-motion techniques. This paper aims to compare four systems: portable scale, stationary truck weigh station, pavement weigh-in-motion system (WIM), and bridge weigh-in-motion system (B-WIM). The first two are reliable, but they have limitations as they can measure only a small fraction of the highway traffic. Weigh-in-motion (WIM) measurements allow for a continuous recording of vehicles. The presented study database was obtained at a location that allowed for recording the same traffic using all four measurement systems. For individual vehicles captured on a portable scale, the results were directly compared with the three other systems’ measurements. The conclusion is that all four systems produce the results that are within the required and expected accuracy. The recommendation for an application depends on other constraints such as continuous measurement, installation and operation costs, and traffic obstruction.
Highlights
The monitoring of traffic-induced load effects is essential to maintain the safety of the transportation infrastructure
It was necessary to find a location that has in close proximity a truck weigh station and additional space to evaluate the weight by portable scales and the weigh-in-motion system (WIM) system
The multiple t-tests for paired means were conducted to determine the mean difference between the truck weigh station and other measurement techniques, that is, the certified portable scales and the rest of the considered weighing systems
Summary
The monitoring of traffic-induced load effects is essential to maintain the safety of the transportation infrastructure. The highway system is a significant part of the national investment, and it requires adequate maintenance. The knowledge of traffic volume and traffic-induced load effects has to be continuously monitored and evaluated. Truck traffic is one of the critical factors influencing transportation safety and efficiency. It is related to a number of traffic accidents, maintenance scheduling, traffic flow interruption, risk control, and management. Traffic weight measurement is required for selecting the design and evaluation loads, as they are needed to design new structures and evaluate existing bridges. Knowledge of the actual live load can serve as a basis for calibration of the live load factors to assure the minimum safety reserve
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