Delaware CDL Permit Test - Double

Air brake system tanks must contain drain valves. These valves are used to drain accumulated oil and water from the tanks and may be either manually or automatically operated.

To avoid becoming an aggressive driver, begin a trip with realistic expectations of how long the trip will take, allowing extra time for traffic delays. Do not tailgate other vehicles. To avoid upsetting other drivers, do not drive slowly in the left lane and do not gesture at the drivers (even in seemingly minor ways, like shaking your head).

Roads are especially slippery when it first begins to rain. Rain water initially mixes with oil and grease on the road to form a slippery film. As the rain continues, this mixture will eventually wash away.

Your vehicle's engine may need to be running in order for you to check the level of its automatic transmission fluid.

When driving in reverse, it is always recommended that a driver backs their vehicle toward its left side. This will allow the driver the best possible view of the rear of their vehicle.

Fatigue and lack of alertness are major hazards when driving at night. Most people are the least alert at night, especially after midnight.

If you are attaching a second trailer to a combination but the trailer is not equipped with spring brakes, you can set the trailer emergency brakes. You can do this by connecting the first and second trailers' emergency lines, charging the air tank, then disconnecting the emergency lines. This should set the emergency brakes, as long as the slack adjusters are properly adjusted.