Practice question

Which answer best matches the official guidance for shut-off valve positions for doubles/triples?

  1. All rear valves open including the last trailer
  2. Valve positions do not matter after coupling
  3. Front or intermediate trailer rear valves open; last trailer rear valves closed
  4. All rear valves closed on every trailer

Answer: C — Front or intermediate trailer rear valves open; last trailer rear valves closed

The correct answer is shown above. Try the full quiz for additional practice.

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