Answer and explanation

Correct answer: D. On unlit roads when there is no oncoming traffic and no vehicle ahead

  1. Step 1: Main beam can dazzle. Step 2. Dip your lights for other traffic, including vehicles ahead whose mirrors would reflect them. Answer: On unlit roads when there is no oncoming traffic and no vehicle ahead. Why not the others: Lit roads and following traffic cause glare, and fog scatters main beam.

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