Impact of non-freeway rumble strips phase 1 : appendix I, driver behavior data for curve locations.

Datta, Tapan K.; Gates, Timothy J.; Savolainen, Peter T. · 2012 · ROSA P / Wayne State University. Transportation Research Group

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Summary

This document serves as Appendix I of a 2012 study by the Wayne State University Transportation Research Group, titled "Impact of non-freeway rumble strips phase 1." It presents detailed driver behavior data collected at various curve locations on Michigan highways (M-81, M-136, M-19, M-93, and US-41) to evaluate the effects of rumble strip installations. The data is organized into "Before" and "After" periods, capturing vehicle observations at tangent sections, left curves, and right curves. The methodology involves field observations recording lateral vehicle placement and encroachments. Data is categorized by vehicle type (passenger vehicles, trucks, and motorcycles) and specific encroachment behaviors, including touching or crossing edgelines and centerlines, with distinctions made for the presence or absence of opposing traffic. The "Before" data covers observation periods ranging from approximately 5 to 18 hours per site, while the "After" data covers similar durations post-installation. The tables provide granular counts of vehicles in left, center, and right lateral positions, as well as specific instances of lane departures. Key findings are presented through comparative tables. For instance, at M-81 Curve 1, total vehicle observations decreased from 1,142 in the "Before" period to 790 in the "After" period. The data tracks changes in encroachment rates; for example, at M-136 Site 1, Curve 3, passenger vehicle edgeline touches on the right side decreased from 641 to 229 in one configuration, while other metrics varied. Aggregate totals show that across all tangent sections, 30,194 vehicles were observed before installation and 20,673 after. For left curves, totals were 18,107 before and 11,938 after. For right curves, totals were 12,095 before and 8,690 after. The data reveals shifts in lateral placement distributions and encroachment frequencies, providing empirical evidence of driver behavior changes following the installation of non-freeway rumble strips. The significance of this data lies in its contribution to understanding how rumble strips influence driver positioning and lane discipline on non-freeway roads. By quantifying encroachments and lateral placements before and after installation, the study supports the evaluation of rumble strips as a safety countermeasure. The detailed breakdown by vehicle type and traffic conditions allows for nuanced analysis of how different road users respond to these pavement treatments, informing future transportation safety policies and design standards.

Key finding

The installation of rumble strips resulted in a measurable reduction in the frequency of vehicle encroachments across the observed curve and passing zone locations.

Methodology

naturalistic

Sample size: 2287

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

What kind of knowledge this paper contributes, grouped by family — independent of topic (what it is about) and method (how it was studied).

• Empirical Findings: observational prevalence, crash risk outcomes
• Methodological Resource: dataset resource