Louisiana CDL Permit Test - Double

The doors of a trailer should be not be opened in the event of a cargo fire, especially if the cargo includes hazardous materials. Opening trailer doors would increase the fire's oxygen supply, potentially causing the fire to increase in size.

It is best not to avoid driving in fog. However, if you must drive under foggy conditions, be sure to decrease your speed.

Driving while fatigued can be extremely dangerous. Strategies for preventing drowsiness while driving include getting a full night's sleep before a trip; having someone ride with you; scheduling trips for times during which you are normally awake; and avoiding medications that may cause drowsiness. Exercising regularly can increase your energy levels and make you less likely to become tired while driving.

Converter dollies built on or after March 1, 1998 are required to have Anti-Lock Braking Systems (ABS). The presence of ABS will be indicated by a yellow lamp on the left side of the dolly.

After a vehicle is started, the warning lights and buzzers should go out after a few seconds. If the warning signals do not turn off, there may be something wrong with the vehicle.

If you are attaching a second trailer to a combination, but you have doubts about the trailer's brakes, you should use wheel chocks to secure the trailer in place while coupling.

Always begin signaling well in advance of a turn. This is the best way to ensure that other drivers do not try to pass you. Without using a turn signal, drivers may assume that you are merely slowing down or stopping when you are planning to turn.