Practice Quiz

Commercial Drivers License Exam Prep

Category - CDL

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If drivers notice that the trailer front edge is too low for their tractor's fifth wheel to slide under, they should:
  1. Continue to ease back, but do so very slowly.
  2. Drain some air from tractor air ride bags.
  3. Add some air to the tractor air ride bags.
  4. Lift the trailer by using its landing gear.
Explanation
Answer: B - Before actually sliding the tractor's fifth wheel under the trailer, drivers should always make a visual inspection to see if the trailer is high enough. If the trailer's front edge is too low, the driver should drain some air from the tractor's air ride bags. This will lower the back end of the tractor enough that it can be slipped under the trailer safely. The driver should then re-inspect to make sure that the tractor fifth-wheel is lower than the fifth-wheel plate on the underside of the trailer.
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