Traffic Control Device Analysis, Testing, and Evaluation Program: FY 2024 Activities
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Summary
This report documents the Fiscal Year 2024 activities of the Traffic Control Device Analysis, Testing, and Evaluation Program, sponsored by the Texas Department of Transportation (TxDOT) and the Federal Highway Administration. The research addresses the evolving needs of highway automation and safety by evaluating specific traffic control issues. The report focuses on three primary areas: the evaluation of driveway assistance devices (DADs) in work zones, a synthesis of practices to deter pedestrians from crossing freeways, and an assessment of safety at rural intersections with flashing beacons. The study on DADs involved field observations at three construction sites on two-lane, two-way roads where lane closures required alternating one-way traffic. Researchers monitored driver compliance with four-section stacked DADs, which synchronize with portable traffic signals to control access from minor driveways. Data collection included recording vehicle arrivals, stop cycles, and violations, categorized by safety risk. The pedestrian safety component relied on a literature review and synthesis of existing countermeasures, analyzing crash trends, contributing factors such as impairment and undocumented immigration, and current practices in TxDOT districts and other states. The third component, regarding rural intersections, utilized connected vehicle data to analyze speed traces and evaluate the safety experience at sites with flashing beacon treatments, comparing treated intersections against control sites. Key findings from the DAD evaluation revealed that while violation rates varied, the majority of non-compliant maneuvers were not considered unsafe. Specifically, 92% of violations with three-section doghouse DADs and 86% with four-section stacked DADs involved drivers anticipating signal changes or joining traffic queues rather than turning into oncoming traffic. However, the four-section stacked DAD showed a higher proportion of unsafe maneuvers, such as turning opposite to the allowed direction. Consequently, researchers continue to recommend the three-section doghouse DAD design. Regarding pedestrian safety, the synthesis highlighted that 21% of fatal pedestrian crashes in Texas occur on limited-access highways, with 43% involving main-lane crossings. Contributing factors include dark conditions, impairment, and intentional crossings for shortcuts or border evasion. The report identifies a need for a comprehensive toolbox of countermeasures, including signage, barriers, and enforcement strategies, to address these high-risk behaviors. The significance of this work lies in providing TxDOT with evidence-based guidance for traffic control device application and pedestrian safety strategies. The DAD findings support the continued use of specific device designs that minimize unsafe driving behaviors in work zones. The pedestrian synthesis underscores the critical nature of freeway crossing incidents, prompting further research into effective deterrence methods. By leveraging connected vehicle data and field observations, the report contributes to the broader goal of enhancing highway safety through improved device design and targeted countermeasures for vulnerable road users.
Key finding
Field studies of driveway assistance devices showed that while violation rates varied across sites, the majority of violations were not considered unsafe driving actions, supporting the continued use of specific DAD designs with supplemental signage.
Methodology
mixed_methods
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.
- rail grade crossings
- perceptual countermeasures
- roadway lighting effects
- signage environment
- regulatory evaluation
- emergency work zone conspicuity
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