A five-axle tractor semi-trailer
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A three-axle tractor semi-trailer
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A bobtail tractor
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A triple trailer
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Number of questions: | 20 |
Passing score: | 16 |
A five-axle tractor semi-trailer
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A three-axle tractor semi-trailer
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A bobtail tractor
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A triple trailer
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Regularly to activate the trailer brakes in all driving conditions.
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Only to test the trailer brakes.
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Only in inclement weather when the trailer may skid.
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Only if the trailer is carrying a load.
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Turn too quickly.
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Do not driving fast enough.
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Pay attention to the road.
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Drive illegally.
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Bobtails stop very easily.
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Bobtails cannot drive as fast as tractors with semitrailers.
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Bobtails are more difficult to stop than tractors with semitrailers.
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Bobtails are illegal in most states.
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Leave the rear shut-off valves open.
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Remove the service line valve.
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Close the emergency line valve.
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Leave the emergency line valve open.
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Green.
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Orange.
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Yellow.
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Red.
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Air pressure drops to a level between 20 and 45 psi.
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You are experiencing a trailer jackknife.
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Wheels have regained traction after a skid.
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Air pressure is above 45 psi.
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