Practice question

What is the universal color coding for commercial tractor-trailer air connection lines?

  1. Green for Service line, Yellow for Emergency line
  2. Blue for Service (control) line, Red for Emergency (supply) line
  3. Black for Service line, White for Emergency line
  4. Purple for Service line, Orange for Emergency line

Answer: B — Blue for Service (control) line, Red for Emergency (supply) line

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