Kentucky CDL — Air Brakes practice
Traffic Laws
Speed limits, turning and signaling rules, headlight and seat-belt requirements, and the everyday laws every driver must follow.
Content reviewed against official driver handbooks · July 7, 2026
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Study questions with answers
1 sample Traffic Laws questions with the correct answer, a short explanation, and the official handbook reference. Read through them, then take the quiz above.
1. About what pressure allows the governor to let the compressor begin pumping again (cut-in)?
Correct answer: Around 100 psi
Cut-in happens near 100 psi and restarts the compressor, while cut-out near 125 psi stops it once more.
Source: Section 5.1.2 - Air Compressor Governor
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