Driving licence exam

Why should you remove a roof box when not using it?

  • Incorrect: It constitutes a traffic hazard, as it may fall down.
  • Correct: It increases air resistance and thereby fuel consumption.
  • Incorrect: The plastic of the roof box emits harmful particles to the air.

Roof boxes and rails create unnecessary air resistance and slow the car down. A roof box can increase fuel consumption by more than 1 decilitre for every 10 kilometres travelled.” (Swedish Transport Administration)


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