Evaluation of non-freeway rumble strips - phase II.
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Summary
This report evaluates the safety effectiveness and economic impact of Centerline Rumble Strips (CLRS) installed on rural, non-freeway highways in Michigan. The study was motivated by the Michigan Department of Transportation’s (MDOT) large-scale implementation of CLRS between 2008 and 2010, which covered nearly 5,400 miles of two-lane high-speed roads. The primary objective was to determine if CLRS significantly reduced lane-departure crashes, such as head-on and run-off-the-road incidents, and to assess the cost-benefit ratio of the program. This Phase II study focused on analyzing three years of post-installation crash data, complementing Phase I findings on driver behavior and noise. The researchers conducted a system-wide "Before" and "After" safety performance analysis using data from 4,214 miles of verified CLRS segments. They collected three years of crash data prior to installation and three years following installation, excluding the installation year to avoid construction-related biases. The study manually reviewed candidate crashes to identify "target crashes"—those involving vehicles crossing or encroaching on the centerline. To ensure statistical validity, crashes occurring on snowy or icy pavement were excluded to prevent weather-related bias. The methodology also included an economic analysis calculating benefit-cost ratios based on crash reduction values and installation costs, as well as surveys of road users and MDOT personnel regarding perceived safety and pavement impacts. The results demonstrated statistically significant reductions in all target crash categories. Overall, there was a 47% reduction in total target crashes and a 51% reduction in fatal crashes. Specific crash types saw substantial declines: head-on crashes decreased by 50.83%, sideswipe opposite crashes by 55.89%, and single-vehicle run-off-the-road crashes by 46.33%. Severity analysis indicated reductions across all injury categories, with fatal crashes dropping by 51.81%. The economic analysis revealed a high return on investment, with benefit-cost ratios ranging from 58:1 to 18:1, depending on discount rates of 2% and 10%, respectively. The estimated total safety benefit over three years was approximately $79.6 million. Surveys indicated strong public support for CLRS as a safety measure, though 61% of maintenance personnel noted changes in their design or maintenance strategies due to the strips. The study concludes that CLRS are a highly effective countermeasure for reducing lane-departure crashes and their severity on rural two-lane highways. The significant crash reductions and favorable benefit-cost ratios justify the widespread implementation of CLRS. The findings provide empirical evidence supporting the use of CLRS to mitigate crashes caused by driver fatigue, distraction, or inattention. Additionally, the study confirms that CLRS do not adversely affect short-term pavement performance, addressing previous concerns about durability. These results offer transportation agencies a robust basis for adopting CLRS programs to enhance roadway safety.
Key finding
The installation of centerline rumble strips resulted in a 47% reduction in total target crashes and a 51% reduction in fatal crashes on two-lane high-speed rural highways.
Methodology
dataset
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).
| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | rosap | — | — | 2 | 2026-05-23 |
| archive | success | — | — | — | 1 | 2026-05-23 |
| extract | success | cached | — | — | 2 | 2026-06-10 |
| clean | success | — | — | — | 1 | 2026-06-01 |
| chunk | success | — | — | — | 1 | 2026-06-01 |
| embed | success | — | — | — | 1 | 2026-06-02 |
| enrich | success | — | — | — | 1 | 2026-05-23 |
| promote | success | — | — | — | 1 | 2026-05-23 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 3 | 2026-06-10 |
| tag | success | vector_similarity | — | — | 19 | 2026-06-11 |
| verify | success | — | — | — | 2 | 2026-06-10 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.
Topics
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- perceptual countermeasures
- incidence prevalence
- adas effectiveness
- regulatory evaluation
- roadway lighting effects
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).
- Applied Guidance: countermeasure evaluation
- Empirical Findings: crash risk outcomes