This is where you go to court and make them provide physical evidence or proof the car was officially there. If they don’t show up, you can get a ticket annulled. If they do, they need to provide evidence in photos that you really were there, especially if you aren’t students. I’ve seen a city do this that was so under the red line, they ticketed out of state cars by making up the tickets and sending them to states way away in order to prevent them from showing up to contest it. They then lost in a class action and were fined (and some people who cooked up the scheme jailed) when they couldn’t produce evidence that the cars even visited the area. Council bluffs, IA pulled this via Red Light cameras with me. I proved I was elsewhere with dash cam footage and gps on phone logs and purchase POS receipts that proved I was in Lincoln NE at the time. It turns out the company that ran and installed red light cameras were pulling a scam. I actually counter-sued for $5,500 since they damaged my credit because of it. (They sent to collections immediately before informing me). I live in Nebraska and never go to Iowa except when I worked at Google, 4 years after date of ticket.