Free CDL Combination Vehicles Test
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Combination Vehicles CDL Test

Question #1 of 21

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What is the emergency air line for?

It supplies air to the tractor air tanks and controls the service brakes on combination vehicles
It supplies air to the trailer air tanks and controls the service brakes on combination vehicles
It supplies air to the trailer air tanks and controls the emergency brakes on combination vehicles
It supplies air to the tractor air tanks and controls the emergency brakes on combination vehicles
None of the above

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