Transverse Rumble Strips at Rural Intersections

Hallmark, Shauna; Oneyear, Nicole; Veneziano, David; Naraghi, Hossein · 2023 · ROSA P / Minnesota. Department of Transportation. Local Road Research Board

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Summary

This study evaluates the effectiveness of different transverse rumble strip (TRS) patterns on driver stopping behavior at rural stop-controlled intersections. Rural intersections account for a significant portion of crashes, particularly those involving drivers failing to yield or run stop signs. While TRS are a low-cost countermeasure providing audible and tactile warnings, previous research has not differentiated the performance of specific TRS configurations. The primary objective was to determine which TRS patterns—varying by the number of panels and strips per panel—most effectively improve safety metrics such as speed reduction and proper stopping. The research team conducted a field study at eight rural intersections in St. Louis County, Minnesota, selected for existing stopping behavior issues. Milled-in rumble strips were installed using four distinct configurations: two sites with 2 panels of 6 strips, two sites with 2 panels of 12 strips, one site with 3 panels of 6 strips, and three sites with 3 panels of 12 strips. Data collection occurred at each site before installation, one month after, and nine months after. Researchers utilized data collection trailers to gather speed, traffic volume, and video data. Key metrics analyzed included changes in average approach speeds, the percentage of vehicles exceeding 40 and 45 mph, the rate of full or rolling stops, stop location relative to the stop bar, late braking instances, and evasive maneuvers. Additionally, noise analyses were performed to assess exterior and in-vehicle noise levels for the 6-strip versus 12-strip designs. Results indicated that the 3-panel, 12-rumble strip design performed best overall. A qualitative scoring system based on four critical safety metrics (average speed reduction, vehicles over 45 mph, full/rolling stops, and late braking) assigned the highest score (1.33) to the 3-panel, 12-strip configuration. Five of the eight sites showed improvements in full/rolling stops one month after installation, with most maintaining these improvements at nine months. Sites with 2 panels of 6 strips generally showed no change or decreases in proper stopping behavior. Noise analysis revealed no significant differences in exterior noise between the 6-strip and 12-strip designs. Both designs produced sufficient in-vehicle noise increases (greater than 6 dB) to alert drowsy drivers, meaning noise was not a differentiating factor in selecting a design. The study concludes that the 3-panel, 12-rumble strip pattern is the most effective configuration for improving stopping behavior and reducing speed-related risks at rural intersections. The findings suggest that this design provides the strongest warning to drivers, leading to earlier braking and more consistent stops. Since noise levels were adequate and comparable across designs, the superior performance of the 3-panel, 12-strip configuration makes it the recommended choice for deployment. This research provides specific guidance for transportation agencies seeking to optimize TRS installations for rural intersection safety.

Key finding

The three-panel, twelve-rumble strip design yielded the highest performance scores for improving stopping behavior and reducing high-speed approaches compared to other configurations.

Methodology

field_study

Sample size: 8

Provenance

The full processing record for this entry. Every stage of this paper's journey through the pipeline is logged — what ran, with which tool and model, how many attempts it took, and when it last completed. Discovered via bulk_ingest_rosap on 2026-05-23 (6 acquisition events logged).

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

Topics

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• perceptual countermeasures
• rail grade crossings