Using Rumble Strips to Encourage Stops at Rural Intersections

Hallmark, Shauna · 2023 · ROSA P / Minnesota. Department of Transportation. Local Road Research Board

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Summary

This study addresses the high rate of fatal crashes at rural intersections in Greater Minnesota, which are often caused by excessive speed and drivers failing to stop. Despite the potential of transverse rumble strips (TRS) as a low-cost safety countermeasure, there is significant inconsistency in their design and placement across jurisdictions. The research aimed to determine which TRS designs are most effective at modifying driver behavior, specifically regarding speed reduction and stopping compliance, while also evaluating noise impacts. The investigation began with a review of previous studies and a survey of TRS specifications across 24 states to identify common design variables. Field testing was conducted at eight rural intersections in St. Louis County, Minnesota. Researchers utilized four distinct TRS designs, varying the number of panels (two or three) and strips per panel (six or twelve), while maintaining standard MnDOT dimensions. The first panel was placed 200 feet before stop signs. Data collection involved upstream and downstream trailers recording vehicle speeds and video footage of driver behavior. Measurements were taken before installation, one month after, and nine months after. Additionally, sound measurements were conducted to assess interior and exterior noise levels in accordance with Federal Highway Administration standards. The results indicated that the presence of rumble strips generally provided safety benefits, with most sites experiencing a decrease in vehicles traveling over 40–45 mph. However, speed reductions from upstream to downstream were minimal, suggesting drivers did not significantly slow down after traversing the strips. More importantly, all sites saw an increase in vehicles coming to a rolling or full stop, as well as an increase in vehicles stopping behind the stop bar. Using a qualitative point system due to the limited number of sites, the three-panel, 12-strip-per-panel design performed best on most metrics, followed by the three-panel, six-strip design. Noise evaluations revealed no significant differences in interior or exterior sound between the six- and 12-strip designs; both produced sound levels sufficient to alert drowsy or distracted drivers. The study concludes that while no single design was definitively superior, the three-panel, 12-strip configuration showed the strongest performance. The findings support the use of TRS as an effective safety measure for rural intersections, provided that a consistent design approach is adopted within a jurisdiction. The lack of significant noise difference between strip counts alleviates some concerns regarding resident disturbance. These results may inform future updates to MnDOT’s standard TRS details and guide county engineers in selecting intersections for implementation, particularly those identified in local road safety plans.

Key finding

All tested transverse rumble strip designs improved stopping behavior and reduced high-speed travel, with the three-panel, twelve-strip-per-panel configuration performing best on most safety metrics.

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