I thought there was a statewide law passed 20 years ago or so where little towns couldn't write tickets on Interstate highways. If memory servers, the very powerful state senator Lowell Barron got a ticket from small town Barney . Next legislative session he solved that problem. Is this not correct?
The town must have a population of 19,000 or greater.
In Texas we had several small towns that acted the same way. Until one of them wrote a ticket for going 2 mph over the speed limit. The driver accepted the ticket and paid. What he failed to mention was he that he was also a state legislator. At the next session he attached a law to some bill that stated any town that generated over 10% of its annual budget revenue from traffic enforcement, had to send any money over the 10% threshold to the state general fund.