Combination Vehicles Practice Test | New Jersey 2025 #2

Train for FREE online with our New Jersey 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 NJ combination license in 2025, 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 . To prevent a rollover, a driver should:

Keep cargo low.

Place cargo high.

Keep cargo loose.

Turn quickly.

Rollovers can happen when a combination vehicle is turned too quickly. To help prevent the risk of rollover, it is important to keep the vehicle's center of gravity low by loading cargo as close to the ground as possible.

2 . Which type of vehicle is most prone to the “crack-the-whip” effect?

A five-axle tractor semi-trailer

A three-axle tractor semi-trailer

A bobtail tractor

A triple trailer

Triple combination trailers are most vulnerable to the "crack-the-whip" effect.

3 . A tractor protection valve is:

A device that keeps air in the tractor or truck brake system, should the trailer break away or develop a bad leak.

A device that prevents theft.

A device that controls fuel levels.

A device that allows the battery to recharge efficiently.

On combination vehicles with air brakes, the tractor protection valve keeps air in the tractor or truck brake system, should the trailer develop a bad leak or break away from the tractor.

4 . Rollovers happen when:

You drive too slowly.

You are stopped.

You turn too quickly.

You plan an escape route.

Rollovers happen as a result of drivers taking turns too fast.

5 . If a trailer's spring brakes do not release when you push the tractor air supply control, you should:

Check the air line connections.

Release the pintle hook.

Replace the spring brakes.

Drive normally without checking anything.

It is important that all of your vehicle's equipment is in proper working condition before you begin a trip. If a trailer's spring brakes do not release when you push in the tractor air supply control, you should make sure the air line connections are properly attached and sealed.

6 . When traveling more slowly than 40 mph, maintain at least ____ of following distance per every 10 feet of your vehicle.

One second

Two seconds

Three seconds

Four seconds

At speeds below 40 mph, you should allow at least one second of following distance for every 10 feet of your vehicle. Follow the same formula when traveling at faster speeds, then add one additional second to your following distance. Remember that larger vehicles require more space to stop than smaller vehicles.

7 . What is another name for the service line?

The signal line

The cable line

The surplus line

The power line

The trailer service air line is also referred to as the control line or signal line.

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2025 New Jersey | Frequently Asked Questions

In New Jersey, to secure a Commercial Driver's License (CDL) bus endorsement, you need to pass the general CDL knowledge test, the Passenger Transport test, and a pre-trip vehicle inspection. Also, you must complete a driving skills test in the type of vehicle you will be driving. You should also meet medical and age requirements.

To obtain a CDL Bus license in New Jersey, you must be at least 18 years old, hold a valid New Jersey driver’s license, pass a vision exam, and complete a medical examination. You'll also need to pass the CDL general knowledge test, the Passenger Transport test, and a driving skills test in a bus.

While New Jersey doesn't mandate specific training for a CDL Bus endorsement, it's highly recommended. Training can help you pass the required knowledge and skills tests. Experience isn't required, but having a clean driving record is crucial. The endorsement process includes a physical exam, background check, and successful completion of the relevant tests.

CDL Bus licenses in New Jersey fall under Class B or Class C. Class B includes buses designed to transport 16 or more passengers (including the driver), while Class C covers vehicles meant to carry 16 or less passengers. Both types require the Passenger ("P") endorsement, and if the bus is school-related, an additional School Bus ("S") endorsement is needed.

No, you cannot use your personal vehicle for the CDL Bus driving test in New Jersey. The vehicle you use must match the type and class of CDL you are applying for. Therefore, for a CDL Bus test, you should use a bus that fits the specific class of license (Class B or Class C).

During the CDL Bus driving test in New Jersey, you'll be evaluated on various skills including pre-trip inspection, basic vehicle control (backing, turning, stopping), and on-road driving (intersections, railway crossings, curves). You'll also be tested on tasks specific to bus operation like loading/unloading passengers, emergency exit procedures, and post-trip vehicle inspections.

Yes, in New Jersey, additional medical prerequisites are required for a CDL Bus endorsement. Applicants must pass a Department of Transportation (DOT) physical examination, which includes vision and hearing tests. The DOT medical card is then valid for up to 24 months. Certain health conditions may disqualify you from obtaining the endorsement.

No, it is not permissible to transport passengers without a valid CDL Bus endorsement in New Jersey. To legally drive a passenger bus, you must hold a Commercial Driver's License (CDL) with a Passenger "P" endorsement. Driving without the appropriate license or endorsement can lead to significant fines and penalties.

In New Jersey, the CDL Bus endorsement can be added to your existing CDL. You do not need to apply for a new license. However, you'll need to pass a written passenger transport test and a skills test in the type of vehicle you'll be driving before the endorsement can be added.

Yes, drivers with a CDL Bus endorsement in New Jersey must adhere to certain restrictions. They must not have more than one license, must maintain a clean driving record, and cannot have any disqualifying criminal offenses. Furthermore, they must comply with federal hours-of-service regulations and may be subject to random drug and alcohol testing.