A weigh-in-motion system with automatic data reliability estimation

Weigh-in-motion stations are used on roads for automatic recording of data on vehicles axle loads. In order to achieve direct legal enforcement, WIM stations should feature an internal real-time method for identification of unreliable measurements. In this paper, two groups of factors were used to assess the degree of measurement reliability. The first group included factors relating to ambient conditions; the second group included factors describing the trajectory and the dynamics of the crossing event (passage). The influence of the factors on the accuracy of the measurements was determined on the basis of an experimental study. The method is based on an appropriately-equipped WIM station and uses an algorithm with fuzzy logic. The results of the study indicate that almost 80% of the measurements are to be considered reliable, of which 40% of the measurements recorded at the WIM station were characterised by very high reliability.