Evaluation of thermal imaging technology for commercial vehicle screening.

Walton, Jennifer R.; Spellman, Mark S.; Crabtree, Joseph D. · 2015 · ROSA P / University of Kentucky Transportation Center

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Summary

This study evaluates the efficacy of thermal imaging technology for screening commercial vehicles to identify brake and tire deficiencies, a critical safety concern given that approximately 35% of large trucks involved in fatal or injury crashes exhibit such problems. Conducted by the Kentucky Transportation Center, the research addresses the challenge of limited enforcement resources, as inspectors can examine only about 1% of the 3.5 million commercial vehicles passing through Kentucky’s facilities annually. The primary objective was to determine if thermal imaging cameras, which detect heat signatures from tires and brakes without stopping vehicles, improve the identification of unsafe vehicles and to develop recommendations for maximizing their utility. The methodology combined a review of previous research, including a Federal Motor Carrier Safety Administration (FMCSA) evaluation, with original data collection. Researchers conducted on-site observations at the Simpson County weigh station, interviewed a primary user of the technology, and analyzed historical inspection data from all 14 of Kentucky’s inspection facilities between April and December 2014. This analysis compared facilities equipped with thermal imaging cameras (Simpson, Kenton, and Laurel Northbound) against those without. The findings demonstrate that thermal imaging significantly enhances enforcement effectiveness. The FMCSA evaluation cited in the report showed that vehicles flagged by thermal imaging had a 59% out-of-service (OOS) rate, compared to 19% for conventionally inspected vehicles. Similarly, Kentucky data revealed that facilities with thermal imaging cameras recorded a 28.5% vehicle OOS rate, nearly double the 15.8% rate at facilities without the technology. Specifically, facilities with thermal imaging identified more than four times as many tire violations per inspection (0.191 vs. 0.042) and a higher proportion of those violations resulted in OOS status (76.7% vs. 49.1%). On-site observations confirmed high accuracy, with 80% of vehicles flagged for tire issues during the study period placed out of service. The study concludes that while thermal imaging is a powerful tool for identifying real-time safety defects, its effectiveness is heavily dependent on operator proficiency and acceptance. The report recommends that enforcement personnel receive periodic training, including supervised practicums, to maintain competency. Additionally, it suggests distributing promotional materials to highlight the technology's value and establishing accountability mechanisms to ensure consistent use. These measures are intended to improve inspection quality and increase the detection rate of critical brake and tire violations, thereby enhancing roadway safety.

Key finding

Facilities with thermal imaging cameras recorded a 28.5 percent vehicle out-of-service rate and significantly higher tire and brake violation rates compared to the 15.8 percent out-of-service rate at facilities without the technology.

Methodology

field_study

Sample size: 14

Provenance

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Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.

Topics

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• automated enforcement cameras