I have seen lots of Villagers simply hang a tennis ball from the ceiling of the garage to the front of the car/cart windshield so one knows just how far to go to comfortably fit the car/cart into the garage.
Have also seen the stop sign sold here [parkez or emerson brand]:
http://www.amazon.com/s?ie=UTF8&page...%20stop%20sign
The Parkez model is also available by mail from Walmart:
Parkez Flashing LED Light Parking Stop Sign For Garage - Walmart.com
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Not sure if I have free time...or if I just forgot everything I was supposed to do!