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Which lamp commonly uses two intensity levels from one source?

  • A.The reversing lamp
  • B.The rear fog lamp, which shares its housing with the tail lamp and is therefore driven at two different levels
  • C.The combined tail and stop lamp
  • D.The direction indicator, which is illuminated brightly during the day and less brightly at night for comfort

Answer: C

A tail lamp glows dimly and brightens when the brakes are applied, formerly with a twin filament bulb and now by modulation. Indicators genuinely are dimmed at night on some vehicles, which makes the second option a real modern feature. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. The shared behaviour explains why these belong together and the differences explain why both exist.

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