For a combination vehicle on a long grade, why is it especially important to select the low gear before starting down rather than while already descending?

Pick an answer

1. Combination vehicles automatically select the correct gear on grades, making manual timing unnecessary for any driver
2. Gear selection only matters for single vehicles, not combinations
3. It is actually easier and safer to shift gears mid-descent once the vehicle has picked up speed
4. Shifting gears while already moving fast downhill with a trailer can be difficult or risky, so the gear needs to be locked in before speed builds up

Correct!

Not quite. The correct answer is highlighted.