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- W615118907 abstract "Weather has significant safety impacts on the roadway system. Icy pavements can significantly reduce the coefficient of friction between automobile tires and road surfaces, and impair the ability of drivers to operate their vehicles safely. Improving traffic safety under icy conditions is of importance to many state transportation departments. To this end, the California Department of Transportation (Caltrans) has deployed an Icy Curve Warning System (ICWS) on a five-mile segment of State Route 36 in Lassen County. This section of roadway has a history as a high-crash location with fatal crashes, the vast majority of which occurred during icy pavement. The objective of this study was to evaluate operational effects of the ICWS, specifically on speeds during various conditions. The results of statistical analysis found that mean speeds were significantly different by greater than 5 mph when the system was on versus off in general, as well as when examined by day and night. Mean speeds were significantly different by greater than 5 mph during wet weather (during day and night). The real interest of the evaluation was the system’s impacts on reducing speeds during conditions when ice was present but unexpected (called clear, cold and not dry in this work). Statistical analysis found that mean speed differences were significant by greater than 3 mph (but less than 5 mph) when the system was on both during the day and at night. Consequently, the ICWS appears to reduce speeds by approximately 3 mph in conditions where icy roads are unexpected." @default.
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- W615118907 date "2012-01-01" @default.
- W615118907 modified "2023-09-28" @default.
- W615118907 title "Speed Impacts of Icy Curve Warning System" @default.
- W615118907 hasPublicationYear "2012" @default.
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