Practice Quiz

Commercial Driver's License

Category - Standard Driving

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Combination truck drivers must always keep their mirrors adjusted. Correct mirror adjustment can only be made:
  1. When the trailer is not attached to the tractor
  2. When the vehicle is on the road
  3. When the trailer is attached at any angle
  4. When the trailer is attached and straight
Explanation
Answer: D - Combination truck drivers must always adjust their mirrors after they have attached their trailers. The trailer or trailers must be straight in line with the tractor before the mirrors can be adjusted properly. The mirrors should be adjusted so that some part of the vehicle is seen in the mirror. This gives drivers a point of reference.
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