The road weather bulletin #2 : road weather management publications and training materials.

Pisano, Paul · 2013 · ROSA P / United States. Federal Highway Administration. Road Weather Management Program

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Summary

This document, titled *The Road Weather Bulletin #2*, serves as a comprehensive summary of publications, reports, and training materials related to road weather management produced by the Federal Highway Administration (FHWA) since June 2011. The bulletin aims to demonstrate progress in managing surface transportation operations and infrastructure maintenance in response to adverse weather conditions. It is organized into four primary thematic areas: connected vehicles and road weather, the Clarus Road Weather Information System (RWIS), weather-responsive traffic management (WRTM), and data performance management. In the realm of connected vehicles, the bulletin highlights initiatives integrating mobile platform observations with fixed-site data to improve meteorological coverage. Key documents include the Passenger Bus Industry Weather Information Application (PBI WxApp), which validated the reliability of mobile data for creating comprehensive weather windows, and the Vehicle Data Translator (VDT) system developed by the National Center for Atmospheric Research. The VDT incorporates vehicle-based measurements into open-source frameworks to support applications for drivers, emergency services, and maintenance crews. Additionally, the Integrated Mobile Observations (IMO) study assessed the quality of mobile data and its incorporation into road weather applications, while a Concept of Operations document defined priorities for connected vehicle-enabled tools, such as enhanced maintenance decision support and weather-responsive traffic management. The bulletin extensively reviews the Clarus RWIS, detailing evaluations from multi-state regional demonstrations. These evaluations covered five use cases: enhanced road weather forecasting, seasonal load restriction tools, non-winter maintenance decision support, multi-state control strategies, and traveler advisories. Findings indicated that while concepts like the Multi-State Control Strategy Tool were valid, they required significant expansion for widespread deployment. Other Clarus-related projects demonstrated the integration of weather data with crash data for route recommendation algorithms, the development of rural traveler information websites, and the creation of weather-responsive traffic signal systems that adapt timing to inclement conditions. Regarding weather-responsive traffic management, the bulletin presents guidelines for variable speed limit systems in wet weather, emphasizing safety improvements through dynamic speed adjustments based on sight distance and surface conditions. It also includes revised guidelines for disseminating road weather advisory information, developed through stakeholder feedback and end-user surveys. Furthermore, reports on WRTM strategies provide roadmaps for evaluating the benefits of over 20 management strategies and frameworks for integrating mobile data into traffic models. Finally, the document addresses data and performance management, featuring an analysis of weather delay costs to the trucking industry and methods for estimating the benefits of winter maintenance operations, using Minnesota DOT data as a case study. It also outlines the evolution of RWMP performance measures since 2007. The bulletin concludes by listing available training courses and best practices case studies from 22 states, facilitating knowledge transfer for transportation managers aiming to improve roadway operations during inclement weather.

Key finding

The bulletin aggregates and reports on the development, evaluation, and implementation of various road weather management technologies, data integration strategies, and operational guidelines published by the Federal Highway Administration between 2011 and 2013.

Methodology

review

Provenance

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

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