I was never aware that a street named court is always a cul-de-sac, but I’ve heard that is the case. In other words, if a street is named “blah court,” it means it’s a cul-de-sac. So far, I have been unable to confirm or disprove the claim. I found a few pages about street types and cul-de-sacs but they didn’t mention the association with courts.
The closest thing I’ve found so far is the 2.d definition from Merriam Webster, defining a court as “a wide alley with only one opening onto a street.” That sounds kind of like a cul-de-sac, but I don’t know anyone who refers to the street they live on as wide alleys.
Does anyone know one way or the other? Another option is if you live on a road ending in court and it isn’t a cul-de-sac, which would at least show there are exceptions, if not disprove the claim.