Abstract
Innovative road signs that can autonomously display the speed limit in cases where the traffic situation requires it are under development. The autonomous road sign contains many types of sensors, of which the subject of interest in this article is the Doppler sensor that we have improved and the constructed and calibrated acoustic probe. An algorithm for performing vehicle detection and tracking, as well as vehicle speed measurement, in a signal acquired with a continuous wave Doppler sensor, is discussed. A method is also experimentally presented and studied for counting vehicles and for determining their movement direction by means of acoustic vector sensor application. The assumptions of the method employing spatial distribution of sound intensity determined with the help of an integrated three-dimensional (3D) sound intensity probe are discussed. The enhanced Doppler radar and the developed sound intensity probe were used for the experiments that are described and analyzed in the paper.
Highlights
We develop innovative road signs that can autonomously determine and communicate the speed limit in cases where the traffic situation requires it in connection with the project that was carried out in our department
Waves that are emitted by the sensor may interfere with other devices operating in the same frequency range
The second method is based on an analysis of sound intensity vectors by means of the acoustic vector sensor
Summary
We develop innovative road signs that can autonomously determine and communicate (visually and over V2X, vehicle-to-everything radio messaging) the speed limit in cases where the traffic situation requires it in connection with the project that was carried out in our department. The engineering part of the project, as well as previous research results on this topic, as described in our earlier papers [3,4], were preceded by a series of experimental studies Their results showed that measuring speed and traffic density causes a number of problems in practical conditions. Inductive loops or pneumatic cables for counting vehicles are used as a source of reliable data Their use requires installation in the road pavement, which is cumbersome and is only suitable for permanent instaRlelmaottieoSnenss,. Their use requires installation in the road pavement, which is cumbersome and is only suitable for permanent instaRlelmaottieoSnenss,. 2r0a2t0h, 1e2r, xthFOaRnPfEoErRtReEmVpIEoWrary installation of road signs in hazardous locations. 2 of 23
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