"The next time you drive past one of those road signs with a digital readout showing how fast you’re going, don’t simply assume it’s there to remind you not to speed. It may actually be capturing your license plate data. According to recently released US federal contracting data, the Drug Enforcement Administration will be expanding the footprint of its nationwide surveillance network with the purchase of “multiple” trailer-mounted speed displays “to be retrofitted as mobile LPR [License Plate Reader] platforms.” The DEA is buying them from RU2 Systems Inc., a private Mesa, Arizona company. How much it’s spending on the signs has been redacted..." https://qz.com/1400791/that-road-si...part-of-a-us-government-surveillance-network/
Do you think those speed watcher signs have a camera that can capture a licence plate on the back of the car?
Seems redundant since they can already track your speed and location by GPS, be it integrated into your car or the phone that at least 1 passenger is likely carrying.