The traditional US cul-de-sac is rounded at the end, and usually has a house at the end (the road was never intended to continue)
Here’s a fairly representative picture of the geometry: https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcS8zguy...
Here’s a fairly representative picture of the geometry: https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcS8zguy...