Why should you lock the tractor glad hands to each other (or dummy couplers) when you are not towing a trailer?

To keep dirt and water out of the lines.. Section 6.2: Connecting them prevents contamination (dirt/water) from entering the air lines.

Why should you lock the tractor glad hands to each other (or dummy couplers) when you are not towing a trailer?

ANSWER BREAKDOWN
  • A. Correct. Connecting them prevents contamination (dirt/water) from entering the air lines.
  • B. Incorrect. "To look neat." is not correct. Connecting them prevents contamination (dirt/water) from entering the air lines.
  • C. Incorrect. "To save space." is not correct. Connecting them prevents contamination (dirt/water) from entering the air lines.
  • D. Incorrect. "To stop the air compressor." is not correct. Connecting them prevents contamination (dirt/water) from entering the air lines.