Application and Evaluation of Rumble Strips on Highways

Cheng, Eric Yuan-Chin; Gonzalez, Ezequiel; Christensen, Mack O. · 2001 · ROSA P / Utah. Dept. of Transportation

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Summary

This study evaluates the safety effectiveness of shoulder rumble strips on highways in Utah, addressing the high prevalence of single-vehicle accidents caused by drivers leaving the travel lane due to fatigue or inattention. Rumble strips serve as a countermeasure by providing auditory and tactile warnings that alert drivers to their departure from the lane, potentially allowing for corrective action before a crash occurs. The research aims to quantify the impact of these devices on accident frequency and severity, while also examining the influence of pavement type and design configuration on their efficacy. The methodology involved a comparative analysis of accident data from 1990 to 1992 across selected interstate segments in Utah, specifically along I-15 and I-80. The study excluded segments containing interchanges to maintain uniform characteristics. The dataset comprised 41 highway segments with shoulder rumble strips (totaling 185.91 miles, split between asphalt and concrete pavement) and 35 comparable segments without rumble strips (110.36 miles). Accident rates were calculated per million vehicle miles to account for traffic exposure. The analysis compared overall accident rates and run-off-the-road accident rates between the two groups, as well as the severity of accidents, defined as those resulting in incapacitating injuries or fatalities. Additionally, the study compared performance between asphalt segments, which featured continuous rumble strips near the travel lane, and concrete segments, which utilized discontinuous, offset strips. The results indicate that highway segments equipped with shoulder rumble strips experienced significantly lower accident rates than those without. Overall accident rates were 33.4% lower, and run-off-the-road accident rates were 26.9% lower on segments with rumble strips. Furthermore, the presence of rumble strips reduced the severity of accidents; the rate of serious accidents per mile was 27.2% lower for overall accidents and 8.7% lower for run-off-the-road accidents compared to segments without the device. When comparing pavement types, asphalt segments with continuous rumble strips demonstrated superior performance, with overall and run-off-the-road accident rates 16.9% and 23.8% lower, respectively, than concrete segments with discontinuous strips. Similarly, serious accident rates were substantially higher on concrete segments, with run-off-the-road serious accidents being 50.4% more frequent than on asphalt. Although statistical t-tests could not verify significance due to unequal variances between groups, the consistent directional trends support the safety benefits of the intervention. The study concludes that shoulder rumble strips are an effective safety countermeasure for reducing both the frequency and severity of single-vehicle run-off-the-road accidents. The continuous design used on asphalt pavement proved more effective than the discontinuous design on concrete, likely because it provides immediate and consistent warning. Based on these findings, the authors recommend prioritizing the installation of wide, continuous rumble strips placed as close to the travel lane as possible, particularly on rural highways with high accident rates. They also suggest using milled-in installation methods to facilitate construction flexibility and ensure adequate buffer zones for cyclists.

Key finding

Highway segments without shoulder rumble strips experienced 33.4% higher overall accident rates and 26.9% higher run-off-the-road accident rates compared to segments with rumble strips.

Methodology

dataset

Sample size: 76

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

Information type

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• Empirical Findings: crash risk outcomes