What does a broken white line along the centre of a road mean?

Answer and explanation

Correct answer: C. It may be crossed when it is safe

  1. Step 1: A broken line allows overtaking or turning across it only when the road ahead is clear and it is safe.
Answer
It may be crossed when it is safe.
Why not the others: It may never be crossed by any vehicle, Parking is allowed along the line and The speed must not exceed 20 km/h don't fit.

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