Safety and Mobility Impacts of Winter Weather --Phase 3, SPR RB01-012, 2014

(2014) Safety and Mobility Impacts of Winter Weather --Phase 3, SPR RB01-012, 2014. Transportation, Department of

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Abstract

Highway agencies spend millions of dollars to ensure safe and efficient winter travel. However, the effectiveness of winter-weather maintenance practices on safety and mobility are somewhat difficult to quantify. Safety and Mobility Impacts of Winter Weather - Phase 1 investigated opportunities for improving traffic safety on state-maintained roads in Iowa during winter-weather conditions. In Phase 2, three Iowa Department of Transportation (DOT) high-priority sites were evaluated and realistic maintenance and operations mitigation strategies were also identified. In this project, site prioritization techniques for identifying roadway segments with the potential for safety improvements related to winter-weather crashes, were developed through traditional naïve statistical methods by using raw crash data for seven winter seasons and previously developed metrics. Additionally, crash frequency models were developed using integrated crash data for four winter seasons, with the objective of identifying factors that affect crash frequency during winter seasons and screening roadway segments using the empirical Bayes technique. Based on these prioritization techniques, 11 sites were identified and analyzed in conjunction with input from Iowa DOT district maintenance managers and snowplow operators and the Iowa DOT Road Weather Information System (RWIS) coordinator.

Item Type: Departmental Report
Keywords: Accident prone locations, Crash risk forecasting, Highway safety, Mobility, Performance measurement, Traffic safety, Weather conditions, Winter, Winter maintenance, Interstate 29, Interstate 35, Interstate 80, U.S. Highway 18, U.S. Highway 63, Iowa Highway 14
Subjects: Transportation
Transportation > Roads and highways
Transportation > Traffic safety
Transportation > Research
Transportation > Maintenance and preservation
ID Code: 18670
Deposited By: Leighton Christiansen
Deposited On: 29 Jan 2015 13:04
Last Modified: 29 Jan 2015 13:04
URI: http://publications.iowa.gov/id/eprint/18670