I think that’s because their driving license tests are so easy to pass. It seems they can’t assume drivers recognize a “no U-turn” sign, even though there’s a

I think that’s because their driving license tests are so easy to pass. It seems they can’t assume drivers recognize a “no U-turn” sign, even though there’s a clear similarity with other signs (round with a red edge and a diagonal red line means forbidden, black arrows mean driving directions) So, they write its meaning below it (https://www.alamy.com/beverly-hills-california-usa-8th-september-2021-a-general-view-of-atmosphere-of-no-u-turn-sign-on-rexford-drive-on-september-8-2021-in-beverly-hills-california-usa-photo-by-barry-kingalamy-stock-photo-image448154940.html https://www.alamy.com/beverly-hills-california-usa-8th-septe...). Weirdly, they do assume their population and tourists can understand written English when passing such signs at speed in a car and even know what a ped xing is. It may be a broader cultural thing, though. Their state flags also are full of text (https://en.wikipedia.org/wiki/Flags_of_the_U.S._states_and_territories https://en.wikipedia.org/wiki/Flags_of_the_U.S._states_and_t...)