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Why not just say it like it is "DEAD END". You need to worn people who are not familar with the street that it is is a dead end. I think there is nothing clearer or more understood by the driver.
For those developers how choose use alot of dead ends in there streets pattern, I say tuff. anything else is week, confusing and pointless.
A culdesac should be signed "Dead Catapillar". Thats what they look like on a the site plan.