Evaluation of Work Zone Safety Using the SHRP2 Naturalistic Driving Study Data – Volume 1 Toolbox of Work Zone Countermeasures
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Summary
This report presents Volume 1 of a multi-phase research project evaluating work zone safety using data from the Second Strategic Highway Research Program (SHRP2) Naturalistic Driving Study (NDS). The research was motivated by significant safety concerns, noting that in 2017, 710 fatal crashes occurred in work zones, accounting for 1.7% of all roadway fatalities, with 60% of worker fatalities resulting from being struck by vehicles. The primary objective was to assess driver behavior, specifically speed management, and to develop a "toolbox" of countermeasures and traffic control devices that effectively mitigate these risks. The study utilized the SHRP2 NDS dataset, which includes kinematic vehicle data and video recordings from 3,400 participants over 30 million miles. Researchers identified active work zones with lane or shoulder closures lasting more than three days using 511 data and the SHRP2 Roadway Information Database. Four specific analyses were conducted: (1) determining the upstream "reaction point" where drivers began decelerating in response to traffic control devices; (2) evaluating factors contributing to back-of-queue safety critical events (crashes or near-crashes); (3) analyzing speed profiles at various points upstream and within work zones on 4-lane and multi-lane roadways; and (4) measuring the change in speed as drivers encountered specific devices like changeable message signs (CMS), dynamic speed feedback signs (DSFS), and temporary transverse rumble strips. These empirical findings were supplemented by a literature review and an analysis of work zone traffic management plans from 16 states. The findings provide evidence-based recommendations for various countermeasures. The report details the effectiveness of specific devices, such as CMS, DSFS, speed limit signs, and "higher fines" signs, in influencing driver speed. It also examines the impact of work zone configurations, barriers, glare screens, and arrowboards. For instance, the study quantified speed changes relative to the legibility distance of signs and assessed how driver distractions, such as cell phone use, correlated with safety critical events and following behavior. The toolbox synthesizes these results to offer guidance on which features have a demonstrated impact on reducing speeds and improving safety in work zones. The significance of this work lies in its provision of a comprehensive, data-driven resource for transportation agencies and engineers. By combining naturalistic driving data with state practices and literature, the report offers actionable recommendations for selecting and deploying traffic control devices. This supports the development of more effective work zone traffic management plans, aiming to reduce crashes and protect both the traveling public and highway workers. The findings help bridge the gap between theoretical safety measures and real-world driver responses, facilitating better-informed decisions in work zone design and operation.
Key finding
The study synthesized SHRP2 naturalistic driving data and literature to create a comprehensive toolbox of recommendations for work zone countermeasures aimed at improving speed management and safety.
Methodology
naturalistic
Sample size: 3400
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 | partial | — | — | — | 2 | 2026-06-10 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified_with_issues.
Topics
Ranked by relevance to this paper. Hover a topic for its definition.
- work zones
- perceptual countermeasures
- emergency work zone conspicuity
- speed management
- rail grade crossings
- speed choice
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, behavioral performance data