Why is choosing your gear before starting down a grade, rather than midway, especially important for a fully loaded truck?
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Correct answer to question 139 (Air Brakes): A loaded vehicle gains momentum quickly, and shifting once already descending can be difficult or unsafe
Why
A heavy load can build speed quickly on a downgrade, making it harder and riskier to find the right gear once already descending, so the gear should be selected before starting down.
Updated: November 2026