I had a funny experience last week that relates to this.
I live in a river bend, where the river surrounds us on 3 sides and the only way in is out the "top" of the bottle. Our street, Old Hickory Boulevard, is part of a loop that runs around Nashville's perimeter. However, when you turn down through the bottle-neck to where I live ... there is a sign: "ROAD ENDS IN WATER - 5 MILES"
And they aren't kidding. If you take that last turn around a stand of trees ... the road become a boat launch and you could very easily go swimming in your car.
Mad1
Jeremy