Railroad Grade Crossing Passive Signing Study.
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Summary
This study evaluated the effectiveness of new passive signing configurations at railroad grade crossings to improve driver awareness and safety. Researchers conducted a two-phase field experiment, with Phase II testing three experimental sign systems across 18 sites in 14 states using before-and-after data collection. The primary measure of effectiveness was the percentage of drivers exhibiting head movements to look for trains, while vehicle speed profiles were also monitored. Results indicated that the new signs significantly increased the rate of driver head movements compared to the standard base configuration, with one specific configuration showing a 6.7 percent improvement. However, the new signs did not produce significant differences in vehicle speed profiles under day or night conditions. The study concluded that the new advance warning signs improved driver attentiveness and recommended a staged implementation process to further evaluate safety benefits.
Key finding
New passive signing configurations significantly increased the percentage of drivers looking for trains at railroad grade crossings compared to the standard configuration, but did not significantly alter vehicle speed profiles.
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 (3 acquisition events logged).
| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | rosap | — | — | 2 | 2026-05-23 |
| archive | success | — | — | — | 1 | 2026-05-23 |
| extract | skipped | empty | — | — | 4 | 2026-06-10 |
| clean | success | — | — | — | 1 | 2026-06-01 |
| chunk | success | — | — | — | 1 | 2026-06-01 |
| embed | success | — | — | — | 1 | 2026-06-02 |
| enrich | skipped | — | — | — | 3 | 2026-07-02 |
| promote | success | — | — | — | 1 | 2026-05-23 |
| summarize | success | llm | qwen3.6-27b | — | 3 | 2026-06-01 |
| tag | success | vector_similarity | — | — | 15 | 2026-06-11 |
| verify | success | — | — | — | 1 | 2026-06-03 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-01; verification: verified.
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