Maine CDL Permit Test - Tank

A tank vehicle transporting liquids is less stable than other vehicles and may be prone to roll over or skid if not operated in a safe manner. If you must make a quick stop to avoid an accident while transporting liquid cargo, it may be a good idea to use the controlled braking method.

You should test the tractor protection valve by allowing the air supply to properly charge, turning off the engine, then releasing air from the system by pressing the brake pedal several times. The tractor protection valve should move into its emergency position when psi drops to an unsafe level.

One way to know when it is time to shift gears is to learn your vehicle's operating rpm range. You should shift up when your engine reaches the top of that range. You can also learn which speeds each gear is good for and shift up based on your speedometer.

Tanks require extra care when being driven because they tend to have high centers of gravity. Drivers operating tank vehicles should be particularly careful when taking curves and corners.

When applying for an original or renewed HazMat endorsement, you must undergo a federal security threat assessment done by the Transportation Security Administration (TSA).

Bridges tend to freeze before other parts of the road surface. You should be especially careful on bridges when temperatures are near the freezing point.

During a trip, you should regularly make checks to ensure that your vehicle is operating properly. Check the instrument panel and gauges; look at your mirrors; and examine the tires, cargo, and lights. Use all of your senses and be alert for anything that could be an early indication of trouble.