Combination #1
Combination Vehicles Practice Test | North Carolina 2025 #1 Page 3 of 4
Train for FREE online with our North Carolina 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 NC 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.
25
20
20
13 . To help prevent rollovers, you should:
Keep the load on one side of the trailer.
To lower the risk of a rollover, load your cargo as closely to the ground as possible. To further reduce this risk, take curves and corners slowly.
14 . Simply changing lanes can cause:
Other drivers to reduce their speed.
Due to the "crack-the-whip" effect caused by rearward amplification, changing lanes too quickly in a combination vehicle can result in a rollover.
15 . 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.
16 . The service air line is often controlled by the foot brake and is attached to the ____ valves.
The service air line carries air and is controlled by either the foot brake or trailer hand brake. The service air line is attached to relay valves, which allow the trailer brakes to be applied quickly.
17 . If unsure if a trailer is equipped with ABS, you can:
Remove a tire and look for the ABS sensor on the axle.
Trailers and converter dollies built on or after March 1, 1998 are required to have Anti-Lock Braking Systems (ABS). This will be indicated by the presence of a yellow malfunction lamp. You can determine if older trailers have ABS by checking under the trailers for ECU and wheel speed sensor wires coming from the back of the brakes.
18 . An Anti-Lock Braking System (ABS):
Assists with the operation of brake lights.
The function of an Anti-Lock Braking System (ABS) is to prevent a vehicle's wheels from locking up during hard braking.
2025 North Carolina | Frequently Asked Questions
To secure a Doubles/Triples endorsement in North Carolina, you must first have a Commercial Driver's License (CDL). Next, you'll need to pass the Doubles and Triples Endorsement Test, which covers coupling and uncoupling, inspecting doubles and triples, and handling. The written test can be taken at your local DMV. Study materials are available online or at the DMV.
To obtain a CDL Doubles/Triples license, you must first have a Commercial Driver's License (CDL). Then, study for and pass the Doubles/Triples Endorsement Test, which covers topics such as coupling and uncoupling, inspecting doubles and triples, and handling. You can take the test at your local DMV. The DMV provides study materials.
While North Carolina does not explicitly require specialized experience or training for a CDL Doubles/Triples endorsement, it is highly recommended. The endorsement test covers specific knowledge areas, such as coupling and uncoupling, inspecting doubles and triples, and handling. Many applicants find that training programs or courses help them prepare for the test and handle these types of vehicles safely.
Yes, to acquire a CDL Doubles/Triples endorsement in North Carolina, you must pass a specific Doubles/Triples Endorsement written examination. This test covers topics like coupling and uncoupling, inspecting doubles and triples, and the proper procedures to handle these types of vehicles. It's an additional test to the standard CDL written exam.
In North Carolina, the CDL Doubles/Triples endorsement does not require a specific skills or maneuvers test. However, the written test covers areas like coupling and uncoupling, inspecting doubles and triples, and handling. It's important to understand these concepts thoroughly. Still, you won't need to physically demonstrate these skills for the endorsement.
No, it's not permissible. In North Carolina, like in all states, a CDL Doubles/Triples endorsement is required to legally operate double or triple trailers. Driving these types of vehicles without the proper endorsement can lead to severe penalties, including fines and potential suspension of your commercial driver's license.
You can add the Doubles/Triples endorsement to your existing Commercial Driver's License (CDL) in North Carolina. You don't need to start a new application for a CDL. However, you must pass the Doubles/Triples endorsement written test and pay the required fee to add this endorsement to your current CDL.
Yes, there are certain limitations for drivers with a CDL Doubles/Triples endorsement in North Carolina. Drivers must comply with the state's weight and length restrictions for double and triple trailers. Also, they can only operate vehicles that their specific CDL class allows. Additionally, all federal regulations regarding hours of service and medical fitness apply.
In North Carolina, a double trailer cannot exceed 28.5 feet in length for each trailer and the maximum gross vehicle weight is 80,000 pounds. However, the weight can vary based on the number of axles and axle spacing. For triples, it's usually limited to hauling within 100 air miles of the driver's work reporting location and they cannot exceed 105 feet in total length.
Yes, safety regulations for driving double/triple trailers in North Carolina include conducting pre and post-trip vehicle inspections, maintaining safe following distances, understanding high wind conditions, and proper coupling/uncoupling procedures. Additionally, drivers must comply with all federal regulations such as hours of service and vehicle maintenance. It's crucial to have a valid CDL Doubles/Triples endorsement to operate these vehicles.