Abstract
Heavy vehicles must be closely monitored to prevent fatigue-induced deterioration and critical fractures to transportation infrastructure. This paper introduces an innovative computer vision-based non-contact vehicle weigh-in-motion method and presents a proof-of-concept study. The method is based on simple physics that tire-roadway contact force equals the contact pressure multiplied by the contact area. The area can be estimated by measuring tire deformation parameters such as tire-roadway contact length and tire vertical deflection using computer vision, while tire pressure can be streamed from on-board sensors. To demonstrate the feasibility of this method, a computer vision system was developed and experiments were conducted involving empty and fully loaded concrete trucks and a sport utility vehicle. Results show high accuracy of vehicle weight estimation, demonstrating the potential of this computer vision-based method as a non-contact means for weighing vehicles in motion.
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