Fixed Cameras on interstates? Already happened in Arizona and will be spreading out statewide over the next few years. NM talked about it and it's in the works. Same with Texas.
The bigger threat on interstates will come first is mobile photo-radar in vans, and lidar units from officers on bridges. Expect Photo-Lidar from vans to become a lot more widespreadand over the next year too. That's already happening too.