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Which lamp function is required to be visible at a wide angle?

  • A.The reversing lamp
  • B.The stop lamp, whose angle of visibility is specified so that a following driver in an adjacent lane may see it
  • C.The direction indicator, seen from ahead and from the side
  • D.The number plate lamp, which must be legible from a wide angle in order that the plate may be read from any position

Answer: C

Indicators have generous angles of visibility specified, supplemented by side repeaters. Stop lamps genuinely have specified angles too, which makes the last option a real requirement of a different lamp. Photometric requirements govern each function. Checking which component actually carries the load settles most questions of this kind at once. The order in which the effects act is what decides the outcome, so it is worth establishing first.

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