Safety Evaluation of Transverse Rumble: Summary Report
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Summary
This study evaluates the safety effectiveness of transverse rumble strips (TRSs) installed on approaches to stop-controlled intersections in rural areas. While previous research indicated that TRSs reduce approach speeds, crash-based studies lacked methodological rigor. This research aimed to determine the impact of TRSs on total crashes, injury crashes, and specific types such as run-stop-sign and right-angle crashes, while also conducting an economic analysis to assess tradeoffs between crash severities. The researchers utilized an Empirical Bayes (EB) methodology to control for regression to the mean and other biases. Data were collected from 154 rural intersections in Iowa (134 sites) and Minnesota (20 sites) where TRSs were installed between 1990 and 2005. Reference sites with similar characteristics but no TRSs were identified to establish baseline crash predictions. Safety performance functions were estimated using generalized linear modeling with a negative binomial error distribution. The study analyzed crash data categorized by severity using the KABCO scale, comparing observed crashes in the after-treatment period against expected crashes had the treatment not occurred. Results indicated a statistically significant increase in property damage only (PDO) crashes, with a crash modification factor (CMF) of 1.19 for the combined sample. Conversely, TRSs significantly reduced severe injury crashes. For the combined sample, fatal and incapacitating injury (KAB) crashes decreased by approximately 21% (CMF 0.785), and fatal and incapacitating injury (KA) crashes decreased by approximately 39% (CMF 0.608). These reductions were statistically significant at the 0.05 level. While reductions in run-stop-sign crashes were observed in Iowa, they were not statistically significant. The apparent increase in PDO crashes alongside the decrease in severe crashes suggests a potential shift in crash severity or type, though specific mechanisms could not be determined due to small sample sizes. An economic analysis revealed that the reduction in severe crashes outweighed the increase in PDO crashes. Using FHWA crash cost estimates, the study calculated a net benefit of approximately $6,683 to $8,168 per intersection per year, depending on the severity metric used. The authors conclude that TRSs are effective in reducing severe injury crashes at rural stop-controlled intersections, likely due to reduced vehicle speeds. However, the study notes that large samples and long observation periods are necessary to detect these effects reliably. Future research is recommended to examine other crash types and varying site conditions.
Key finding
Transverse rumble strips significantly reduced fatal and severe injury crashes at rural stop-controlled intersections, resulting in a net economic benefit despite an increase in property damage only crashes.
Methodology
field_study
Sample size: 154
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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- regulatory evaluation
- incidence prevalence
- comparative international
- perceptual countermeasures
- adas effectiveness
- crash typology
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