That sign telling you how fast you’re driving may be spying on you

https://qz.com/1400791/that-road-sign-telling-you-how-fast-youre-driving-may-be-part-of-a-us-government-surveillance-network/?utm_source=MIT+Technology+Review&utm_campaign=f8f4419138-EMAIL_CAMPAIGN_2018_10_02_11_34&utm_medium=email&utm_term=0_997ed6f472-f8f4419138-153856085