The Commercial Drivers License (CDL) Study Guide

The effect of vehicle weight on stopping distance.


The heavier the vehicle, the more work the brakes must do to stop it and the more heat they absorb. But the brakes, tires, springs, and shock absorbers on heavy vehicles are designed to work best when the vehicle is fully loaded.

Empty trucks require greater stopping distances, because an empty vehicle has less traction. It can bounce and lock up its wheels, giving much poorer braking. (This is not usually the case with buses)

Matching Speed to the Road Surface

Identifying Slippery Surfaces.


Speed and Curves

Speed and Distance Ahead

Speed and Traffic Flow

Speed on Downgrades


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