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Which requirement accompanies discharge headlamps in most regulations?

  • A.A separate main beam lamp, which is required because a discharge lamp cannot be switched rapidly for flashing
  • B.Nothing additional
  • C.A warning device for the driver, which indicates when the lamps are in use because of the glare they may produce
  • D.Automatic levelling and a cleaning device

Answer: D

The intensity makes glare a serious matter, so self levelling and headlamp washers are required. A separate main beam or a bi-xenon shutter genuinely is needed too, which makes the second option a real accompanying requirement. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Tracing the requirement back to the physical constraint that produces it makes the answer follow. The shared properties explain why these belong to one family, and the differences explain why more than one exists.

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