NTL-SAFETY AND SECURITY-Highway Safety ; NTL-INTELLIGENT TRANSPORTATION SYSTEMS-Road Weather Management ;

The impacts of weather on the nation’s road system greatly affect safety, mobility, and productivity. Weather affects roadway safety through increased crash risk, as well as exposure to weather-related hazards. On average 7,130 fatalities and 629,000 injuries occur every year during adverse weather conditions. Weather impacts roadway mobility by increasing travel time delay, reducing traffic volume throughput and speeds, increasing speed variance (a measure of speed uniformity), and decreasing roadway capacity (maximum rate at which vehicles can travel). Further, weather events influence productivity by disrupting access to road networks, and increasing road operating and maintenance costs.

US Transportation Collection
Federal Highway Administration