U.S. officials are warning that foreign-made solar power components used in American highway infrastructure may contain undocumented cellular radios, posing a significant security risk. A Federal Highway Administration advisory notes these devices have been found in power inverters and battery management systems that run everything from traffic cameras to EV chargers. The primary concern is that a foreign adversary, implicitly China, could exploit these hidden components to remotely trigger power surges, cause widespread outages, or covertly steal data. This alert reflects escalating U.S. government action against potential security vulnerabilities in Chinese technology embedded within critical infrastructure, urging transportation agencies to inventory, scan for, and remove any rogue hardware to mitigate the risk of sabotage and large-scale surveillance.