Best Practices for Road Weather Management: Version 2.0

Goodwin, Lynette C. · 2003 · ROSA P / Road Weather Management Program (U.S.)

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Summary

**Problem and Motivation** This report addresses the challenge of managing surface transportation systems during adverse weather conditions, which significantly impact roadway safety, mobility, and productivity. While there is a common perception that transportation managers have limited control over weather, the document argues that three distinct mitigation strategies—advisory, control, and treatment—can effectively reduce environmental threats. Advisory strategies provide real-time information to motorists and managers; control strategies adjust roadway devices to regulate traffic flow and capacity; and treatment strategies deploy resources to minimize weather impacts. The report aims to counter the belief of helplessness by documenting successful implementations of these strategies across various weather hazards, including fog, high winds, snow, ice, flooding, and hurricanes. **Methods and Data** The primary methodology involves the compilation and analysis of 30 case studies from 21 U.S. states, illustrating systems that improve roadway operations under inclement weather. Each case study is structured to detail the system description, components, operational procedures, transportation outcomes, implementation issues, and relevant contacts. The report also includes appendices covering environmental sensor technologies, acronyms, online resources, and a tabulation of hundreds of related publications. Specific examples analyzed include the Alabama DOT’s low visibility warning system, the California DOT’s motorist warning system, and the Florida DOT’s wet-pavement warning system. These cases highlight the integration of technologies such as environmental sensor stations, variable speed limit signs, dynamic message signs, and pavement sensors. **Findings** The case studies demonstrate that targeted weather management systems yield measurable improvements in safety and efficiency. For instance, the California DOT’s automated warning system in the San Joaquin Valley eliminated fog-related crashes entirely after its deployment in 1996, compared to 19 such crashes in the preceding four years. Similarly, the Florida DOT’s system on a high-crash ramp reduced the 85th percentile speed by 8% to 20% during rain events and decreased speed variance by 8% to 15%, resulting in zero reported crashes during a nine-week evaluation period after an initial adjustment week. The Alabama DOT’s fog warning system improved safety by reducing average speeds and minimizing crash risk through coordinated variable speed limits and dynamic messaging. Additionally, maintenance vehicle management systems, such as those in Aurora, Colorado, improved productivity by 12% and reduced treatment costs through real-time tracking and communication. **Significance** The report concludes that proactive road weather management is a viable and effective approach to mitigating the negative impacts of adverse weather on transportation networks. By providing concrete evidence from diverse geographic and operational contexts, the document validates the use of advisory, control, and treatment strategies. It serves as a practical guide for transportation agencies, offering specific technical details and operational procedures that can be adapted to local conditions. The findings underscore the importance of integrating sensor technologies with traffic management systems to enhance traveler safety, improve traffic flow uniformity, and optimize maintenance operations, thereby challenging the notion that weather impacts are unmanageable.

Key finding

Automated motorist warning systems significantly reduced low-visibility crash frequencies and improved safety by adjusting traffic speeds, while maintenance vehicle management systems enhanced operational productivity by 12 percent.

Methodology

dataset

Sample size: 30

Provenance

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Topics

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• weather rain fog snow