Correct answer
In adjusting, horizontally and vertically, the beam of light projected by the headlights.
The adjustment of a bus's headlights consists of adjusting their height and position both horizontally and vertically, with the aim of avoiding dazzling other road users so it can be driven more safely.
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In properly adjusting the width of each headlight.
In adjusting, horizontally and vertically, the beam of light projected by the headlights.
In checking that the headlights' orientation is as low as possible.
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