Evaluating the benefits of centerline rumble strips on rural highways : Research Spotlight

Datta, Tapan · 2012 · ROSA P / Michigan. Dept. of Transportation. Bureau of Field Services

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Summary

This research report evaluates the safety and operational impacts of centerline rumble strips on rural, non-freeway highways in Michigan. Motivated by a statewide initiative launched in 2008 to reduce lane-departure crashes, the Michigan Department of Transportation (MDOT) installed milled centerline rumble strips on 5,400 miles of highways with posted speed limits of 55 mph. This initiative represents the largest deployment of its kind in the United States. The study aims to confirm whether these strips effectively protect motorists by altering driver behavior and reducing crashes, while also assessing secondary effects on pavement durability, roadside noise, and bicyclist safety. These findings are intended to guide future implementation strategies in Michigan and provide a model for other states. The methodology involved a comprehensive evaluation of several rural two-lane highway segments. Researchers utilized pole-mounted high-definition cameras to capture video data of driver behavior both before and after the installation of rumble strips. This visual data allowed for the analysis of lane centering, frequency of centerline or shoulder encroachment, vehicle speeds, and passing maneuvers. Additionally, a field study compared lateral displacement when drivers passed bicyclists, supplemented by surveys of Michigan bicyclists regarding safety and comfort perceptions. The researchers also established a baseline crash database for pre-installation comparison, utilized MDOT’s pavement management system video logs to assess pavement performance, and measured roadside noise levels. The results indicate that centerline rumble strips significantly improve driver performance under most conditions. Drivers positioned their vehicles more centrally within lanes, resulting in fewer encroachments over centerlines and shoulders, thereby enhancing safety. Specifically, drivers were less likely to cross the centerline when passing bicyclists when rumble strips were present. Regarding infrastructure and environment, the strips did not contribute to short-term transverse cracking in asphalt pavements. While vehicles traveling over rumble strips generated higher noise levels than those on regular pavement, this noise typically did not exceed levels produced by tractor-trailer trucks on normal highways. Furthermore, the installation had no measurable impact on overall travel speeds. Crash data analysis focused on identifying locations where crashes were expected to be alleviated, setting the stage for longitudinal comparison. The significance of this research lies in its potential to establish standard guidelines for rumble strip installation. The findings suggest that centerline rumble strips significantly increase safety on high-speed non-freeway highways. A second phase of the study is planned to evaluate driver behavior and analyze crash data for three years post-installation to confirm these initial observations. The resulting data will support cost-benefit analyses and may lead to expanded installation on county roadways. Ultimately, this research provides valuable evidence for transportation agencies nationwide to design and implement effective safety and operational improvement programs.

Key finding

Centerline rumble strips on rural high-speed non-freeway highways led drivers to position themselves more centrally with fewer centerline and shoulder encroachments and reduced centerline crossing when passing bicyclists, while having no effect on overall travel speed.

Methodology

field_study

Provenance

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

Topics

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• perceptual countermeasures