Evaluation of Driver Feedback Signs
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Summary
This 2006 report evaluates the effectiveness of Driver Feedback Signs (DFS) in reducing vehicle speeds and improving pedestrian safety in school zones within the District of Columbia. The study was motivated by high pedestrian injury rates and the difficulty drivers face in complying with 15 mph school zone limits on arterial roads with 35 mph posted limits. DFS units use radar to display a vehicle’s real-time speed, aiming to compel motorists to slow down. The research objective was to determine if DFS deployment significantly improved driver compliance and pedestrian safety conditions. The study employed a before-and-after experimental design at five elementary school locations: Raymond, Webb, Maury, Randle Highlands, and Stanton. These sites were selected based on high average daily traffic (10,000–30,000 vehicles), history of pedestrian conflicts, and citizen complaints. Data collection occurred during morning and afternoon peak periods, with baseline data gathered between November 2004 and January 2005, and post-installation data collected between June and November 2005. Researchers used surrogate measures of effectiveness (MOEs) because actual crashes are rare events. Safety MOEs included the proportion of pedestrian-vehicle conflicts and the proportion of braking drivers. Mobility MOEs included mean pedestrian delay and mean vehicle speeds. Additionally, customer satisfaction surveys were administered to drivers and pedestrians to assess perceived safety and awareness. The results indicated mixed effectiveness. There was no statistically significant change in the proportion of pedestrian-vehicle conflicts or mean pedestrian delays before and after DFS installation. However, the proportion of braking drivers increased significantly at more than 50% of the locations, with an average increase of 42% in braking frequency. This effect was strongest on two-lane roads with unobstructed views of the sign. Regarding vehicle speeds, statistically significant reductions occurred at only 25% of the sites; however, speeds decreased by up to 7 mph at 69% of the locations. Survey data revealed that while 63% of drivers who noticed the sign adjusted their speed downward, over 90% of pedestrians did not perceive any improvement in safety or vehicle behavior. The study concludes that DFS can increase driver braking and reduce speeds, but their effectiveness is highly dependent on site-specific conditions. The authors recommend against universal deployment. Instead, DFS should be installed only in school zones where mean speeds are 35 mph or greater, provided the signs have clear visibility (150–200 ft), are located on two-lane roads, and are not obscured by parking or sign clutter. The report warns that an overabundance of DFS or excessive sign clutter can mitigate their positive effects, suggesting they are best used as targeted countermeasures rather than a blanket solution.
Key finding
The installation of Driver Feedback Signs resulted in a statistically significant 42 percent average increase in the proportion of braking drivers, though mean vehicle speed reductions were statistically significant at only 25 percent of the study sites.
Methodology
field_study
Sample size: 5
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.
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Information type
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- Applied Guidance: countermeasure evaluation
- Empirical Findings: observational prevalence, crash risk outcomes