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Which lamp assists visibility in fog at the front of a vehicle?

  • A.The main beam headlamp, whose greater intensity penetrates the fog and therefore improves the visibility ahead
  • B.The daytime running lamp
  • C.A dipped headlamp used together with a front fog lamp, which is the combination recommended in dense fog conditions
  • D.A front fog lamp with a wide flat beam

Answer: D

A wide low beam lights the road edges without reflecting back from the fog. Using the fog lamps with dipped beam genuinely is the recommended practice, which makes the last option a correct statement of usage. Main beam reflects back and blinds the driver. Naming what changes and what stays the same is the reliable route through questions of this shape. Most errors here come from carrying across a result from a neighbouring case where it does not hold.

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