MD 210 Before and After Case Study for Speed Management Practices
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Summary
This study evaluates the effectiveness of speed management countermeasures installed on Maryland Route 210 (MD 210), a roadway identified as one of the most dangerous in the state. Despite previous efforts involving automated speed enforcement and high-visibility patrols, MD 210 continued to experience high crash rates, with 3,433 crashes and 8,707 injuries recorded between 2015 and 2022. To address persistent safety issues, the Maryland Department of Transportation implemented non-traditional engineering countermeasures, including narrowing lanes from 12 to 11 feet and installing quick-curbs with flex-posts on shoulders. The research aimed to determine whether these interventions significantly improved safety performance by analyzing a broader range of unsafe driving behaviors beyond just speeding. The researchers employed a multi-faceted data-driven framework utilizing both traditional and non-traditional traffic safety data. Data sources included probe vehicle speed data from INRIX, historical crash records from the Maryland State Police, and telematics-style event data from Michelin Mobility Solutions. The Michelin data provided insights into harsh acceleration, harsh braking, excessive speeding, and origin-destination trip patterns. To ensure rigorous evaluation, the study utilized Gower distance for selecting appropriate control sites. Statistical analysis was conducted using Interrupted Time Series (ITS) and Difference-in-Differences (DiD) models to compare safety performance measures before and after the countermeasure installation, accounting for confounding factors such as traffic volume changes and regression to the mean. The primary finding of the study was that the installed countermeasures did not significantly impact the safety performance of MD 210. Despite the implementation of lane narrowing and shoulder treatments, the statistical models indicated no substantial reduction in key safety metrics, including crash occurrences and harsh driving events. The analysis revealed that the interventions failed to produce a measurable improvement in driver behavior or crash rates on the treated segments compared to the control sites. The significance of this study lies in its demonstration that conventional and non-traditional engineering countermeasures may not be sufficient to mitigate safety risks on high-crash corridors like MD 210 when used in isolation. The results suggest that further safety improvements are necessary, potentially requiring a more comprehensive approach that integrates multiple strategies. The study also highlights the utility of combining non-traditional data sources, such as telematics event data, with rigorous statistical methods like DiD and ITS to evaluate traffic safety interventions. These findings provide critical insights for transportation agencies seeking to address persistent speeding and crash issues, emphasizing the need for continued innovation and evaluation in speed management practices.
Key finding
The installed speed management countermeasures on MD 210 did not significantly improve safety performance measures.
Methodology
field_study
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
Ranked by relevance to this paper. Hover a topic for its definition.
- regulatory evaluation
- speed management
- perceptual countermeasures
- speed choice
- incidence prevalence
- exposure measurement
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, observational prevalence