Practice question

Which choice is safest and most consistent with FLHSMV/FMCSA rules for shut-off valve positions for doubles/triples?

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

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

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