The SUN Act (Solar Use Network Act) allows electric vehicle charging stations, renewable energy facilities, electrical transmission lines, and broadband infrastructure to be built within the space along federal highways. Currently, federal highway regulations restrict what can be built in these areas, but this bill removes those restrictions for these specific infrastructure types. States would have the authority to approve and accommodate these facilities within highway rights-of-way on behalf of the federal transportation secretary. The bill does not specify funding amounts or implementation timelines. This legislation affects highway departments at the state level and companies involved in electric vehicle, renewable energy, utility, and broadband infrastructure development.