Downshifting Commercial Vehicles

Posted in CDL Exam Questions


CDL Test: Downshifting Commercial Vehicles

Q.: When is the proper time to begin downshifting commercial vehicles like combination vehicles, delivery trucks, or tractors?

A.: Before starting down a hill, when the downgrade may cause your commercial vehicle to gain speed at an unsafe rate.

Explanation: You should downshift commercial vehicles either before going down a hill or before you enter a curve. The braking effect of the engine is greatest when it is near the governed RPMs and the transmission is in the lower gears.