Evaluation of Motorist Warning Systems for Fog-Related Incidents in the Tampa Bay Area

NHTSA · 1997 · ROSA P / University of South Florida. Center for Urban Transportation Research

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Summary

This 1997 report by the Center for Urban Transportation Research (CUTR) evaluates fog-related traffic incidents in the Tampa Bay area (Hillsborough and Pinellas counties) to determine recurring patterns and suitable countermeasures. The study was motivated by a major 54-vehicle pileup on the Sunshine Skyway Bridge in December 1996, which raised concerns about the need for fog detection and warning systems. The research aimed to define local fog conditions, compare crash rates with other Florida counties, review national countermeasures, and recommend an area-wide plan to improve driver safety during limited visibility. The researchers conducted a four-month investigation utilizing historical meteorological data from the National Climatic Data Center and crash report data from the Florida Department of Highway Safety and Motor Vehicles for the period 1987–1995. They analyzed 829 fog-related crashes in the Tampa Bay area, examining variables such as time of day, driver demographics, vehicle types, roadway locations, and contributing causes. The study also reviewed meteorological characteristics, noting that fog in the region typically forms during December through February under specific conditions: air temperatures between 40–60°F, high humidity, light winds, and clear skies. The analysis revealed that fog-related crashes accounted for 0.30% of all crashes in the Tampa Bay area, slightly below the statewide average of 0.32%. Crucially, crash sites were scattered throughout the region with no specific "fog-prone" locations, making targeted infrastructure interventions difficult to justify. Nearly 60% of crashes occurred between December and February, with 48% happening during the 6 a.m. to 9 a.m. commute window. Drivers aged 20–29 were the most frequently involved group, and most drivers were local residents familiar with the roads. In 42% of cases, drivers were not cited for improper actions, though careless driving and failure to yield were common when citations were issued. Most crashes involved passenger vehicles traveling straight on local or county roads in rural settings. The report concludes that because fog formation is highly variable and lacks specific geographic hotspots, expensive detection and warning systems are not cost-effective for the Tampa Bay area. Instead, CUTR recommends a focused driver awareness campaign as the primary countermeasure. This campaign should educate motorists on the local "fog season," historical crash data, and safe driving techniques, such as maintaining uniform reduced speeds. The findings suggest that improving driver behavior through education is more viable than attempting to predict or detect fog in real-time, given the limitations of current forecasting accuracy and the diffuse nature of fog-related incidents in the region.

Key finding

Fog-related crashes in the Tampa Bay area were geographically scattered with no specific high-risk locations, leading to the recommendation of a driver awareness campaign over physical detection systems.

Methodology

dataset

Sample size: 829

Provenance

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Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.

Topics

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• weather rain fog snow