The proposed work is located in Mohave, Coconino, Navajo, Apache, Yavapai, and Cochise Counties, along Interstate 40, Interstate 17, Interstate 10, State Route 377, State Route 77, State Route 260, US Route 60, US Route 93, and US Route 180. The work consists of constructing new road weather information systems (RWIS) and upgrading the existing RWIS.