Why is the low air pressure warning test still relevant to check even in a multi-trailer combination with several tanks contributing to overall system air?

Pick an answer

1. Low air pressure warnings only apply to the dolly's tank
2. The warning only functions with a single trailer attached
3. More tanks in a combination make the low air warning system completely unnecessary since the driver is assumed to notice a pressure problem some other way before it becomes dangerous
4. The warning is meant to alert the driver whenever total available pressure drops below a safe level, regardless of how many tanks exist

Correct!

Not quite. The correct answer is highlighted.