Florida wave loading study : improving driver and pedestrian safety, Traffic Engineering Research Lab.
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Summary
This document, the Fall/Winter 2010 issue of the Florida Department of Transportation (FDOT) Research Showcase, details completed research initiatives aimed at enhancing transportation infrastructure resilience and safety. The publication highlights two primary studies: one addressing bridge vulnerability to coastal storm forces and another focusing on human factors affecting driver and pedestrian safety, particularly for older populations. The Florida Wave Loading Study was motivated by the catastrophic damage inflicted on the I-10 twin bridges across Escambia Bay by Hurricane Ivan in 2004. The storm’s 130 mph winds and 15-foot surge caused severe wave action that trapped air under bridge decks, generating upward forces of 900,000 pounds and knocking 58 spans off their foundations. To address this, FDOT contracted the University of Florida to conduct physical wave tank tests on slab and girder spans using field data from the I-10 incident. Led by Dr. Max Sheppard, researchers developed a wave force model to determine drag and inertia coefficients for estimating wave forces. The study successfully hindcasted the I-10 failure and established that replacement bridges must stand above the 500-year wave crest, approximately 25 feet above the mean high water line. These findings informed new AASHTO specifications adopted in 2008 and enabled FDOT to prioritize coastal bridge retrofits based on criticality and vulnerability criteria. Concurrently, FDOT partnered with Florida State University to investigate how aging affects the ability of drivers and pedestrians to interpret road signs and signals. Led by Dr. Neil Charness, the study utilized both laboratory and field-based tasks to assess three age groups. Researchers examined sign legibility under various lighting conditions and the decision-making processes of pedestrians using countdown signals. Results indicated that while fluorescent sheeting offered a slight visibility advantage, its efficacy depended on headlight intensity. Crucially, the study found that older pedestrians, despite being more conservative in initiating crossings, were more likely to attempt crossing medium and long intersections without sufficient time. Consequently, the researchers recommended adopting more conservative crossing times for intersections frequented by older adults. The significance of these studies lies in their direct application to policy and infrastructure design. The wave loading research provided the scientific basis for updated national bridge design standards and strategic funding allocation for storm-resistant retrofits. The human factors research supports the "Safe Mobility for Life Program," offering evidence-based recommendations to reduce driver and pedestrian error among Florida’s growing elderly population. Additionally, the showcase outlines the role of the Traffic Engineering Research Lab (TERL) in certifying traffic control devices and developing testing standards, ensuring that transportation equipment meets safety and reliability requirements.
Key finding
Older pedestrians comprehend countdown pedestrian signals at significantly shorter distances than younger pedestrians but are more likely to cross without sufficient time at medium and long intersections, suggesting a need for more conservative crossing time policies.
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 | skipped | — | — | — | 3 | 2026-07-02 |
| 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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- Applied Guidance: countermeasure evaluation
- Methodological Resource: dataset resource