Combination #2
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.
20
16
20
1 . To prevent a rollover, a driver should:
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 triple trailer
Triple combination trailers are most vulnerable to the "crack-the-whip" effect.
3 . A tractor protection valve is:
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 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:
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.
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 power line
The trailer service air line is also referred to as the control line or signal line.
2025 New Jersey | Frequently Asked Questions
In New Jersey, to secure a CDL Doubles/Triples endorsement, you must already have a valid CDL. You'll need to pass a knowledge test specific to driving double and triple trailers. This test covers topics like coupling and uncoupling, inspecting doubles and triples, and handling these vehicles. After passing the test, the endorsement will be added to your CDL.
To obtain a CDL Doubles/Triples license, you must first have a Commercial Driver's License (CDL). You'll then need to pass a knowledge test specific to driving double and triple trailers. This test covers topics like coupling and uncoupling, inspecting doubles and triples, and handling. After you successfully pass the test, the endorsement is added to your CDL.
While New Jersey doesn't require specific training for a CDL Doubles/Triples endorsement, it's recommended to get some practice. You must pass a knowledge test on handling these types of vehicles. Studying the CDL manual and taking practice tests can help. Some choose professional driver training schools to gain practical experience before the test.
Yes, to obtain a CDL Doubles/Triples endorsement in New Jersey, you must pass a knowledge test specific to driving double and triple trailers. The test covers topics such as coupling and uncoupling, inspecting doubles and triples, and handling. This is in addition to the general CDL written exam.
For the CDL Doubles/Triples endorsement in New Jersey, you don't have to perform a specific skills or driving test. The endorsement requires only a knowledge test. However, general skills like safe coupling and uncoupling, maintaining vehicle balance, and understanding the high rollover risk are crucial when operating these vehicles. Always refer to your state's CDL manual for complete information.
No, it's not permissible. In New Jersey, and across the U.S., driving double or triple trailers requires a Commercial Driver's License (CDL) with a Doubles/Triples endorsement. Operating these vehicles without the appropriate endorsement is illegal and can result in significant fines, penalties, and potentially loss of your CDL.
Yes, you can append the Doubles/Triples endorsement to your existing CDL. You don't need to initiate a new application for a CDL. However, you will need to pass the Doubles/Triples endorsement knowledge test and pay the required fee to add it to your current CDL in New Jersey.
Yes, there are limitations for drivers with a CDL Doubles/Triples endorsement. These include restrictions on the maximum length of trailers, adherence to specific coupling and uncoupling procedures, and understanding the handling characteristics of double/triple trailers. Violations can result in fines, penalties, or suspension of the endorsement or CDL.
In New Jersey, the maximum legal weight for a vehicle is 80,000 pounds, and the maximum length for a two-trailer combination is 58 feet. For a three-trailer combination, the maximum length is 65 feet. These limits can be exceeded only with special permits and under certain conditions. Always check specific regulations as they can vary.
Yes, there are specific safety guidelines for driving double/triple trailers. Drivers must ensure proper coupling and uncoupling of units, maintain safe following distance, and understand the high rollover risk. They should also be aware of the special considerations for longer combination vehicles, like the impact of "crack-the-whip" effects on stability and control.