Practice question

For the Kentucky CDL Combination Vehicles test, which statement is correct about hand valve and jackknife?

  1. Close every shut-off valve before moving the combination.
  2. Do not use the trailer hand valve to straighten a jackknifing trailer.
  3. Use actual loaded weight instead of GVWR or GCWR for CDL class decisions.
  4. Use the trailer hand valve for normal braking while driving.

Answer: B — Do not use the trailer hand valve to straighten a jackknifing trailer.

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