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Question
During a trip, which shut-off valves should be open?
Answers
A.  All shut-off valves should be open.
B.  The rear shut-off valves should be open.
C.  All shut-off valves should be in the open position, except the rear shut-off valves.
D.  No shut-off valves should be open.
Explanation
When starting a trip, be sure that all shut-off valves are in the open position, except for the last valves on the rear trailer. It is important that air reaches the brakes on all trailers and that the air is not able to escape from the back of the vehicle.

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