DRLs is short for Daytime Running Lights or Daytime Running Lamps. These are lights on the front of vehicles that are automatically activated when you start your car or put it in gear. In the US they are implemented on either the low or high beam headlights, the turn signal lights, or as a separate light altogether. Obviously, the "standard" is pretty loose. At least foglights are not permitted to be used as DRLs. DRLs are intended to make a car more visible to oncoming traffic, but their benefits are nil.

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