Mackinac Island sits in the Straits of Mackinac, right between Michigan's Lower and Upper Peninsulas, and has long been known as a source of world-class fudge, horse-drawn carriages and an ongoing 128-year ban on automobiles. In the absence of cars, the island still reported four drunk driving arrests between 2020 and 2023. It’s far from the only place in the nation to cite people for drunk driving without a vehicle, as places look to regulate e…