Q
54. When backing a tractor under a trailer you should:
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Aa. Do it quickly to ensure that the kingpin is locked into the fifth wheel.
Bb. Always use the lowest reverse gear.
Cc. Always approach the trailer at a slight angle.
Detailed Explanation
The correct answer is "b. Always use the lowest reverse gear.". This is based on federal CDL regulations and safety standards.
Correct Answer: b. Always use the lowest reverse gear.
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