I got a speeding ticket from a camera on I-29 in Sioux City about 10 years ago.
The company that operates the cameras is based out of Arizona and splits the fines 50/50 with the state.
They send you a photo of your vehicle and license plate in the mail, along with the fine. I was to show up to Sioux City court on a specified date.
I ignored it and they never came after me. I figured since I was out of state there was nothing Iowa could do to me. i.e. Suspend my Nebraska license, etc.
I also figured that in US courts you have a right to face your accuser. Are they gonna drag the speeding camera (that's on a trailer) into the courtroom? NOT