Mackinac Island, located in Lake Huron, between the lower and upper peninsulas of Michigan, is completely car-free (with the exception of a few emergency vehicles). But, it isn’t for any of the reasons that listed above, or any you could guess. It’s actually all about the horses.
Bikes and horses coexist fairly amicably on the island, but on the main drag it can be a mishmash with slow and steady horses carrying their passengers and cargo stoically along, while bicyclists zip in and out, sometimes narrowly missing the horses. The horse taxi drivers can be heard calling out at pedestrians and bicyclists that don’t move or are too close.