Iowa's speed cameras have mostly found to be illegal, by the Iowa DOT

In Iowa, several cities recently had to shut off most of their fixed-location speed cameras due to the implementation of a new law by the state’s Department of Transportation

Out of the 139 fixed camera locations across the state, only 11 were approved to continue operating.

By requiring local governments to prove the necessity of speed cameras, Iowa has created a system where safety measures must meet a high standard of justification.

https://unionrayo.com/us/goodbye-speed-cameras-state-turn-off-all/