In 2000 ODOT began installing pavement sensors and Global Positioning System (GPS) tracking devices, as well as generating computer-modeled snow plow routes to enhance its snow and ice removal program. The pavement sensors relay valuable information such as pavement and air temperature, precipitation accumulation and wind speed. By identifying and reporting weather conditions on the highway, the sensors help ODOT prioritize its response and more efficiently clear the roads. A number of pavement sensors currently exist on highways around the state. Data from these sensors is transferred to ODOT's district offices, and entered into the Road and Weather Information System(RWIS) on the ODOT web site. Motorists can track winter weather conditions by accessing RWIS on the internet. RWIS also lists winter weather advisories, snow warnings, and highway closures. The information is kept current and is available 24 hours per day.