NC CDL General Knowledge Practice Test

Using a retarder in conditions where traction is poor can result in the skidding of drive wheels. Retarders, which are devices that help slow down a vehicle without using the traditional brakes, operate by creating resistance in the drivetrain. When traction is compromised, such as on slippery roads due to rain, snow, or ice, the application of a retarder can cause the drive wheels to lose grip on the road.

In such conditions, if the retarder is engaged, it can create an imbalance between the braking force and the available traction. When the wheels cannot maintain contact with the surface due to the added resistance from the retarder, they may begin to skid. This is particularly problematic as skidding can lead to a loss of control over the vehicle, potentially resulting in further accidents or unsafe situations. Proper use of retarders requires a careful assessment of road conditions to ensure safety.