I imagine they're pretty similar to the speed cameras I've encountered as far as how they're run. In AZ on my wedding day, I got two speeding tickets on the way to my wedding. From two cameras a 1/4-mile apart on the same stretch of road. I looked into fighting them (what stops them from putting them even closer together? 10 tickets for someone speeding through a half mile, score!), but from what I could see from others experiences the court the tickets went through was pretty well in bed with the company running the cameras, and the judge would uphold tickets in outrageous circumstances.
My favorite was someone got a ticket from this system in the mail, it wasn't their car in the photo, and was obviously not them driving. The judge still ordered them to pay. They had to appeal to the superior court to get the ticket rescinded. Given experiences like that I figured it wouldn't be worth the trouble, paid the extortion money and vowed to not spend any money in the relevant city again if I can avoid it. They have since removed the cameras in the state, I believe.