Accuracy verification of magnetic sensors in different weather conditions

An intelligent transport system cannot exist without high-quality information about transport. One of the possibilities for data collection is a sensory transport network. The city of Žilina has a wireless network of magnetic sensors built a few years ago. I continuously collect traffic information. It monitors all lanes in the direction to and from the city center. The sensors thus create an area bounded by virtual gates which count entering and exiting vehicles. The sensory network sends obtained data by each sensor to a publicly accessible database. This article also describes mentioned database that provides the traffic flow characteristics – intensity, speed, and classification of vehicles. The question of the magnetic sensors used is their accuracy. Their function is counting, speed measuring, and vehicle classification. Sensors detect all these characteristics based on the magnetic field changes by passing vehicles. In this paper, the authors verify the accuracy of the sensors in two traffic surveys in warm weather and winter conditions. In both surveys, certain deviations were evident, but they did not fundamentally affect the accuracy of vehicle counting.