In which of these situations is changing direction (turning) prohibited?

En español: ¿En cuál de estas situaciones está prohibido cambiar de dirección (girar)?

A When visibility is insufficient to turn safely Correct answer
B When there is no oncoming traffic
C When driving slowly
D When you have signalled in advance

Why this is the correct answer

Changing direction is prohibited where vertical signs or road markings forbid it, and also where visibility is insufficient to do it safely.

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