Evaluation of New Weigh-in-Motion Technology at the Virginia Smart Road

Weigh-in-Motion (WIM) systems have improved the process of collecting data from heavy vehicles on the U.S. highway system and enforcing the laws that govern vehicle weights. The benefits of WIM are reaped by everyone from highway designers and government officials, to truck drivers and transportation industry owners. The data collected by WIM devices is essential for proper pavement design, developing pavement management systems, weight enforcement strategies, modeling traffic improvement projects, and predicting load-related distresses and performance. While WIM offers many advantages over its alternative, static weighing, the technology is limited by problems associated with the accuracy of its measurements. Weigh-inMotion systems that lack accuracy require vehicles to travel slower and can result in higher queues, longer delays, and potential hazards. For these reasons, WIM system performance must be improved in order to adequately serve its purpose. In order to evaluate WIM system performance and determine what vehicle characteristics have the most affect on it, two systems in the Commonwealth of Virginia were evaluated. The first system was an in-service WIM system at the Troutsville weigh station on I-81. The Troutsville station has bending plate WIM scales located in both the northbound and southbound directions. The second system is a newly developed WIM system manufactured by Omni Weight Corporation (OWC) and was installed at the Virginia Smart Road for evaluation. The OWC scale is a completely sealed and buried system that has ten strain gauge sensors in its interior. Evaluation of both scales was performed by conducting a number of tests runs under varying load conditions. Testing at Troutsville was performed using four different test vehicles with multiple loads on each. Variation in load was achieved by loading the test vehicles with various numbers of concrete Jersey Walls. Testing on the OWC scale was performed using only two test vehicles while varying the speed, load, tire pressure, and direction of travel over the scale. The study showed that the scales at the Troutsville weigh station yielded 10% error or less on only 77% of the tests, not complying with the required 95% set forth by ASTM E-1318. In comparison, using the manufacturer’s processed data for the OWC scale yielded only 18% of its tests with 10% error or less, far below the ASTM standard. A model was developed to recalculate the axle weights using the raw sensor data from the OWC scale; and an evaluation of the accuracy of this data showed that the OWC scale performed much better. While compliance with the ASTM standards was still not achieved, it rose from 18% to 71% of the tests having 10% error or less. Repeatability of the Troutsville scales and OWC scales was found to be comparable. Siegel Acknowledgements iii ACKNOWLEDGEMENTS I would like to give thanks to my advisor and teacher, Dr Imad Al-Qadi, for his support, guidance, and help throughout this research process. Additionally, thanks are given to my committee members, Dr. Amara Loulizi and Dr. Gerardo Flintsch, for their support and help on this project. For their time, help, and friendship, I would like to express my extreme gratitude to Randy Orren and Kenneth Taylor of the Virginia Department of Transportation. Without their countless hours behind the wheel, this project would never have come to be. Thanks also go to the staff of the Virginia Department of Motor Vehicles at the Troutsville weigh station for their input and contribution to this project. I would also like to thank my family for their love and support, which has gotten me through during this process. I would like to thank my wife, Kelly, for all the sacrifices she has made to help me through this. I could not have done it without all her confidence, support, and love. Siegel Table of