According to an advisory disseminated by Department of Transportation’s Federal Highway Administration on Aug 20, solar-powered highway infrastructure including chargers, roadside weather stations, and traffic cameras should be scanned for the presence of rogue devices — such as hidden radios — secreted inside batteries and inverters.
Undocumented cellular radios had been discovered in certain foreign-manufactured power inverters and BMS — battery management systems. The note, which has not previously been reported, did not specify where the products containing undocumented equipment had been imported from, but many inverters are made in China.
There is increasing concern from US officials that the devices, along with the electronic systems that manage rechargeable batteries, could be seeded with rogue communications components that would allow them to be remotely tampered with on Beijing’s orders.
In its advisory, the Federal Highway Administration warning cited federal and state-level reporting about “undocumented cellular radios” found inside inverters and batteries and that national-level assessments had determined that they could pose a risk.
The advisory said the devices were used to power a range of US highway infrastructure, including signs, traffic cameras, weather stations, solar-powered visitor areas and warehouses, and electric vehicle chargers. The risks it cited included simultaneous outages and surreptitious theft of data.
The alert suggested that relevant authorities inventory inverters across the US highway system, scan devices with spectrum analysis technology to detect any unexpected communications, disable or remove any undocumented radios, and make sure their networks were properly segmented.
Back in May, experts found rogue communication devices in some Chinese inverters and batteries. Later that month, industry group Green Power Denmark said that unexplained electronic components had been found in imported equipment for Denmark's energy supply network.
Separately, Washington has also raised concerns over the presence of Chinese autos on US highways, worrying that companies could collect sensitive data while testing autonomous vehicles in the US.
In January, the Commerce Department finalized rules that will effectively bar nearly all Chinese cars and trucks from the US market by late 2026, as part of a crackdown on vehicle software and hardware from China.
https://reuters.com/legal/government/us-warns-hidden-radios-may-be-embedded-solar-powered-highway-infrastructure-2025-09-10/…
Department of Transportation’s Federal Highway Administration on Aug 20, solar-powered highway infrastructure including chargers, roadside weather stations, and traffic cameras should be scanned for the presence of rogue devices — such as hidden radios — secreted inside batteries and inverters.
Undocumented cellular radios had been discovered in certain foreign-manufactured power inverters and BMS — battery management systems. The note, which has not previously been reported, did not specify where the products containing undocumented equipment had been imported from, but many inverters are made in China.
There is increasing concern from US officials that the devices, along with the electronic systems that manage rechargeable batteries, could be seeded with rogue communications components that would allow them to be remotely tampered with on Beijing’s orders.
In its advisory, the Federal Highway Administration warning cited federal and state-level reporting about “undocumented cellular radios” found inside inverters and batteries and that national-level assessments had determined that they could pose a risk.
The advisory said the devices were used to power a range of US highway infrastructure, including signs, traffic cameras, weather stations, solar-powered visitor areas and warehouses, and electric vehicle chargers. The risks it cited included simultaneous outages and surreptitious theft of data.
The alert suggested that relevant authorities inventory inverters across the US highway system, scan devices with spectrum analysis technology to detect any unexpected communications, disable or remove any undocumented radios, and make sure their networks were properly segmented.
Back in May, experts found rogue communication devices in some Chinese inverters and batteries. Later that month, industry group Green Power Denmark said that unexplained electronic components had been found in imported equipment for Denmark's energy supply network.
Separately, Washington has also raised concerns over the presence of Chinese autos on US highways, worrying that 
companies could collect sensitive data while testing autonomous vehicles in the US.
In January, the Commerce Department finalized rules that will effectively bar nearly all Chinese cars and trucks from the US market by late 2026, as part of a crackdown on vehicle software and hardware from China.
reuters.com/legal/governme