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2024 AZ CDL Practice Test: Double and Triples - Test 3

13. On a combination vehicle, the air lines are often colored to prevent the driver from confusing the two. The emergency line is _______; the service line is _________.
A
Purple, yellow.
B
White, black.
C
Red, blue.
D
Red, green.
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Double and Triples - Test 3
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