I believe they've gotten rid of those vehicles now. Most were owned by a quasi-religious organization that was more or less voted off the island. I believe snowmobiles (called sleds in northern Michigan) are still allowed, but I'm not sure. It's difficult for tourists to visit the island in winter, but a couple hundred people live there year round. I have a co-worker who grew up on the island. She had to board on the mainland for high school. I suppose that nowadays some of the kids are home schooled.