What are 'Shut-off Valves'?

Valves used to cut off the air flow at the back of the trailer.. Section 6.2: Shut-off valves are at the back of trailers. They must be

What are 'Shut-off Valves'?

ANSWER BREAKDOWN
  • A. Correct. Shut-off valves are at the back of trailers. They must be open on the front trailer and closed on the last trailer.
  • B. Incorrect. "Valves in the engine." is not correct. Shut-off valves are at the back of trailers. They must be open on the front trailer and closed on the last trailer.
  • C. Incorrect. "Valves on the tires." is not correct. Shut-off valves are at the back of trailers. They must be open on the front trailer and closed on the last trailer.
  • D. Incorrect. "Valves for the fuel." is not correct. Shut-off valves are at the back of trailers. They must be open on the front trailer and closed on the last trailer.