The Commercial Drivers License (CDL) Study Guide

 

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Hydroplaning.

In some weather, water or slush collects on the road. When this happens, your vehicle can hydroplane. Itís like water skiing: the tires lose their contact with the road and have little or no traction. You may not be able to steer or brake. You can regain control by releasing the accelerator and pushing in the clutch. This will slow your vehicle and let the wheels turn freely. If the vehicle is hydroplaning, do not use the brakes to slow down. If the drive wheels start to skid, push in the clutch to let them turn freely. It does not take a lot of water to cause hydroplaning. Hydroplaning can occur at speeds as low as 30 mph if there is a lot of water. Hydroplaning is more likely if tire pressure is low or the tread is worn. (The grooves in a tire carry away the water; if they arenít deep they donít work well). Be especially careful driving through puddles. The water is often deep enough to cause hydroplaning.

Speed and Curves

Speed and Distance Ahead

Speed and Traffic Flow

Speed on Downgrades


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