It's funny because reading this thread yesterday, it made me observe any signs painted on the roadways on my drive home from work, and then I started thinking about STOP signs. In California, the STOP sign and limit line are accompanied by a big white STOP painted beneath the limit line; here's an example from Eureka--I chose a city in California FAR from me, just to make sure it was a statewide thing:
https://www.google.com/maps/@40.7912...7i13312!8i6656
But it seems other states (and presumably other countries) don't do that.
Here's an example from Vancouver, BC:
https://www.google.com/maps/@49.2417...7i16384!8i8192
Champaign, IL:
https://www.google.com/maps/@40.1164...2!8i6656?hl=en
Washington, DC:
https://www.google.com/maps/@38.9123...4!8i8192?hl=en
And then NYC has a painted "STOP" on the roadway:
https://www.google.com/maps/@40.6803...4!8i8192?hl=en
But Yonkers, NY does not:
https://www.google.com/maps/@40.9309...4!8i8192?hl=en
So I'm thinking NYC has its own unique road markings and street signs, separate from New York State DOT?
And I learned this some years ago, that different states have their own standards for road signs and lane markings.
MUTCD adoption map (US Manual on Uniform Traffic Control Devices):
Green are the states that adopted the US MUTCD.
Orange are states that adopted the US MUTCD, with their own state supplements.
Purple are states that have their own state-specific MUTCD. California, for example has those big green "FREEWAY ENTRANCE" signs at all freeway onramps:
https://www.google.com/maps/@34.1739...4!8i8192?hl=en
And notice the 101 route shield signs are cut out and shaped like the shield itself, California being the only state to do that with the US-Highway route markers.