This sign became the default in the States in the 1950s and in Europe in 1968 under the Geneva Convention that the US did not sign. The result is that many American road signs do not follow European and world convention – the world system runs on subliminal identification, such as shapes and colour, rather than roads, whereas American signs still have words written all over them, which renders them far less effective. Also one of the factors why the US lags so far behind the rest of the Western world in road safety
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