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 Passenger endorsement in Maine, you must first hold a valid Commercial Driver's License (CDL). Then, you need to pass the Passenger Transport Test, which covers the special skills and knowledge needed for these vehicles. Additionally, you may need to pass a skills test in a vehicle similar to the one you'll be driving.

To obtain a CDL Passenger license in Maine, you must be at least 21 years old, have a valid Commercial Driver's License (CDL), pass a Passenger Transport written test, and complete a skills test in the type of vehicle you plan to drive. You should also have a clean driving record and pass a medical examination.

Yes, specific training is essential for securing a CDL Passenger endorsement in Maine. You must pass a written Passenger Transport Test, which covers specific knowledge related to passenger vehicles. Additionally, you'll need to complete a skills test in the type of vehicle you'll be driving. Prior experience driving commercial vehicles can be beneficial but is not mandatory.

Yes, in Maine, to secure a CDL Passenger endorsement, you must pass a written Passenger Transport Test. This test covers specific rules and safety procedures related to passenger vehicles. Furthermore, after passing the written test, you will need to take a skills test in the type of vehicle you plan to drive.

During the CDL Passenger endorsement assessment in Maine, you will need to showcase specific skills and maneuvers. These may include proper vehicle inspection, safe loading and unloading of passengers, effective communication with passengers, smooth acceleration and braking, lane changes, turns, and backing maneuvers. Additionally, you should demonstrate knowledge of passenger safety regulations and emergency procedures.

No, you cannot legally transport passengers in Maine without a valid CDL Passenger endorsement. This endorsement is required by law for drivers who wish to operate a vehicle that can carry 16 or more passengers, including the driver. Driving without this endorsement can result in serious penalties, including fines and suspension of your CDL.

To add the CDL Passenger endorsement to your existing license in Maine, you will need to submit a new application. You cannot simply add the endorsement to your current license without going through the application process. You will need to meet the requirements for obtaining a CDL, including passing the written knowledge test and skills test specific to the Passenger endorsement.

Yes, there are certain restrictions for drivers with a CDL Passenger endorsement in Maine. These include maintaining a clean driving record, not having any serious traffic violations, and passing regular physical examinations. Additionally, drivers may not consume alcohol or use controlled substances while operating a commercial vehicle. Failure to comply can result in the suspension or revocation of the endorsement.

Yes, there are age-related prerequisites for acquiring a CDL Passenger endorsement in Maine. The minimum age required is 21 years. This is a federal regulation applicable across all states for drivers who wish to drive commercial vehicles across state lines. However, those aged 18-20 may obtain a CDL for intrastate driving (within Maine only).

With a CDL Passenger endorsement in Maine, you are eligible to operate vehicles such as buses, shuttles, and any other commercial vehicle designed to transport 16 or more passengers, including the driver. This includes school buses if you also have a School Bus endorsement. The Passenger endorsement allows you to drive these vehicles for both interstate and intrastate transit.