Back when the speed limit was 55, there was a sign on I-75 just as you crossed into Ohio from Michigan that listed the fines 55-60 X$$, 60-65...etc.
The Ohio state police patroled I-75 like ants on a food trail. My dad, a retired Detroit police officer, was pulled over the only time in his life along that stretch. He and mom were only doing 58 mph.....
He and several other cars were all pulled over, they were spotted by the airplane patrol who called in to the police cruisers that radar'ed the group then pulled them over. Dad didn't get the ticket because of his retiree badge but the other cars did.
Coincidence? Maybe, but I prefer to believe the Ohio troopers were deliberately targeting the Michiganders heading south........An OSU - U of M thing....;.
At one time there was a billboard on I 10 as you entered Louisiana from Mississippi and was paid for by someone or group from Mississippi, that read, “ You are now entering Louisiana, please set your clocks back 3 seconds.”