Combination Vehicles Practice Test | Maine 2026 #2

Train for FREE online with our Maine CDL combination vehicle test. The official exam test consists of several obligatory parts, with all of them checking your knowledge of different blocks of road rules. If you need to obtain a ME combination license in 2026, practice as much as possible. Free sample tests published on our website will help you check and improve your knowledge and boost your grades. Please bear in mind that DMV requirements for issuing a combination license may vary from state to state.

Number of Question 20

Passing Score 16

Number of Tests 20

1 . In a vehicle equipped with an automatic tractor protection valve, the valve will pop out when air pressure drops to a level between:

20 and 45 psi.

75 and 105 psi.

50 and 65 psi.

In vehicles equipped with an automatic tractor protection valve, the valve will pop out if air pressure drops to a level between 20 and 45 psi. When the valve pops out, the protection valve will close, stopping the flow of air.

2 . After completing a pre-trip inspection, you should ensure that the:

Service line valve is closed.

Trailer hand brake is applied.

Emergency line valve is open.

Before a trip, you should ensure that air reaches all air brakes on all trailers by opening up the rear emergency line and service line shut-off valves and listening for escaping air. Close both shut-off valves before beginning to drive.

3 . Combination vehicles need extra space on the road because they:

Drive more slowly than other commercial motor vehicles.

Are heavier than other commercial motor vehicles.

Need more space to turn and stop than other commercial motor vehicles.

Combination vehicles need more space on the road than other commercial vehicles because they are longer and need more space to turn and stop. It is especially important to properly manage space when you are operating a combination vehicle.

4 . The trailer hand valve should be used:

To test the trailer brakes.

To check the connection between the trailer and tractor.

To accelerate.

The trailer hand valve (also referred to as the "trolley valve" or "Johnson bar") works the trailer brakes and should be used only when testing them. Using the trailer hand valve while driving could result in a skid.

5 . Shut-off valves:

Prevent air from escaping air brake systems.

Prevent air from entering air brake systems.

Override vehicles that are out of control.

Shut-off valves are used in air supply lines to control the passage of air from one trailer to another. The rear shut-off valve should always be closed to prevent air from leaving the braking system.

6 . Keeping cargo centered on a rig can:

Help you drive faster.

Prevent a rollover.

Make turns more dangerous.

A rollover is more likely if cargo is unevenly loaded in a rig. To help prevent a dangerous rollover, it is important to keep a load as centered on the rig as possible.

7 . Rollovers happen when:

You drive too slowly.

You are stopped.

You take a turn too fast.

Rollovers are caused by operators turning too fast. To avoid rolling over, drive slowly on entrance ramps, on exit ramps, and around corners. Avoid making quick lane changes when towing trailers.

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2026 Maine | Frequently Asked Questions

To acquire a CDL Tank endorsement in Maine, you must already have a Commercial Driver's License (CDL). Next, study the Tank Vehicles section of the Maine CDL Handbook. Then, schedule and pass the Tank Vehicles Knowledge Test at your local Bureau of Motor Vehicles (BMV) branch. Upon passing, you'll receive your endorsement. Training courses are also available to help prepare for the test.

Obtaining a CDL Tank license requires having a Commercial Driver's License (CDL) first. You must study the Tank Vehicles section of your state's CDL handbook, then pass the Tank Vehicles Knowledge Test at your local Bureau of Motor Vehicles. Successful completion of this test will grant you the CDL Tank endorsement. Taking a training course is also beneficial.

While specific training or experience is not mandatory to get a CDL Tank endorsement in Maine, it's highly recommended. Studying the Tank Vehicles section of the Maine CDL Handbook is necessary. Passing the Tank Vehicles Knowledge Test at the local Bureau of Motor Vehicles is also required. Training courses, though not compulsory, can help prepare for this test.

Yes, to obtain a CDL Tank endorsement in Maine, you must pass the Tank Vehicles Knowledge Test. This is an additional written exam that covers specific knowledge related to operating tank vehicles. The information for this test can be found in the Tank Vehicles section of the Maine CDL Handbook.

The written test for a CDL Tank endorsement covers several subjects, including the inspection of tank vehicles, safe driving practices for tank vehicles, and safe loading and unloading procedures. It also includes questions about the handling of emergencies and the properties of different types of liquids and gases you might transport.

The CDL Tank endorsement assessment does not involve a skills or maneuvers test. Rather, it is a written test that examines your knowledge of operating tank vehicles. This includes understanding the vehicle's handling characteristics, the importance of inspecting tank vehicles, and the procedures to follow when loading and unloading cargo.

Yes, there are certain limitations for drivers with a CDL Tank endorsement. They are only allowed to operate tank vehicles, which are specifically designed to transport liquid or gaseous materials within a tank. Additionally, if the tank is not permanently attached to the vehicle, it must have a rated capacity of 1,000 gallons or more.

No, you cannot legally transport liquid or gas materials without a valid CDL Tank endorsement in the United States. This endorsement is required for drivers who wish to operate a tank vehicle, defined as a commercial vehicle designed to transport any liquid or gaseous materials within a tank either permanently or temporarily attached to the vehicle.

You can add a CDL Tank endorsement to your current commercial driver's license. You don't need to apply for a new license. However, you must pass the Tank Vehicle written test. After passing, the endorsement will be added to your existing CDL, enabling you to operate tank vehicles legally.

Yes, handling hazardous materials with a CDL Tank endorsement requires an additional Hazmat endorsement. To obtain this, you must pass a written test about the regulations and safety precautions for handling hazardous materials. Additionally, a TSA background check is required to ensure you're not a security risk.