Novel Highway Signs Study to Support Infrastructure-Based Motorcycle-Crash Countermeasures: Phase II
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Summary
This study addresses the disproportionately high rate of motorcycle fatalities in the United States, which have more than doubled since 1994 despite declines in other crash types. The research investigates whether novel highway signs can serve as effective infrastructure-based countermeasures to reduce motorcycle crashes. Specifically, the study evaluates signs designed to alert road users to hazards particularly dangerous for motorcyclists, focusing on four categories identified in prior research: motorcycle awareness, advance curve warning, pavement condition, and limited sight distance. The goal was to determine if existing signs are adequate or if new designs specifically targeting motorcyclists would improve comprehension and safety. The methodology involved a multi-phase approach. First, the research team generated a preliminary set of novel signs based on a literature review and Phase I findings. These signs were evaluated through an online questionnaire distributed to motorcyclists to gather feedback on usefulness and design. Based on these results, the stimulus set was refined. Second, a human factors-based experimental assessment was conducted to test the comprehension and legibility of the refined signs. This experiment included both motorcyclists and non-motorcyclists as participants. The assessment measured how accurately participants understood the signs’ messages and determined the distances at which the signs remained legible. The study produced a prioritized list of five novel signs deemed effective potential countermeasures. The experimental results provided specific data on sign comprehension, categorizing responses as correct, partially correct, or incorrect, and measured mean legibility distances for each sign type. The findings indicated that certain novel designs were more effective than existing standards in drawing attention to hazards such as sharp curves, poor pavement conditions, and limited sight distances. Additionally, the study highlighted the importance of addressing "looked-but-failed-to-see" errors, where drivers fail to notice motorcycles due to low conspicuity and mental models that prioritize four-wheeled vehicles. The novel motorcycle-awareness signs aimed to update these mental models, while curve and pavement signs provided critical advance warning for riders navigating hazardous road geometries. The significance of this work lies in its contribution to the Manual on Uniform Traffic Control Devices (MUTCD) and broader traffic safety engineering. By providing evidence-based recommendations for novel signs, the study supports the development of infrastructure that specifically addresses the unique risks faced by motorcyclists. The prioritized list of five signs offers engineers and policymakers concrete options for reducing crash frequencies at high-risk locations. The findings underscore the potential of targeted signage to mitigate specific crash mechanisms, such as run-off-road collisions on curves and intersection crashes caused by driver inattention, thereby offering a scalable solution to improve motorcycle safety nationwide.
Key finding
A prioritized list of five novel highway signs was identified as effective motorcycle-crash countermeasures based on superior comprehension and legibility ratings from experimental testing.
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.
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