Combination #1
Combination Vehicles Practice Test | Oklahoma 2025 #1 Page 3 of 3
Train for FREE online with our Oklahoma 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 OK 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.
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15 . If the emergency air line loses pressure:
The tractor protection valve keeps air in the trailer's braking system should the trailer break away or develop a leak. A loss of air pressure in the emergency line will cause the tractor protection valve to open and the emergency trailer brakes to activate.
16 . When driving while pulling trailers, you should:
You should always steer gently and smoothly while pulling a trailer. Making sudden steering moves could cause the trailer to tip over.
17 . Rearward amplification refers to:
Vehicles with trailers are vulnerable to rollover due to the "crack-the-whip" effect, which is caused by rearward amplification.
18 . What does an Anti-Lock Braking System (ABS) do?
An Anti-Lock Braking System (ABS) helps prevent wheel lockup during hard braking. If ABS detects impending lockup, it reduces braking pressure to a safe level.
19 . Fully-loaded rigs:
Fully-loaded rigs are more vulnerable to rolling over than empty rigs because the weight of the cargo gives the vehicles higher centers of gravity.
20 . Keeping cargo low can:
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.
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2025 Oklahoma | Frequently Asked Questions
In Oklahoma, to acquire a CDL Passenger endorsement, you must first possess a Commercial Driver’s License (CDL). Next, study the Oklahoma CDL manual's passenger transport section. After studying, schedule and pass the written knowledge test at a Department of Public Safety testing facility. Some may also need to pass a skills and driving test in the type of vehicle you plan to operate.
To obtain a CDL Passenger license in Oklahoma, you must be at least 21 years old, possess a valid Commercial Driver's License (CDL), and pass the passenger transport written knowledge test. In some cases, you may also need to pass a skills and driving test in the type of vehicle you plan to operate. A clean driving record is also crucial.
While Oklahoma doesn't require specific training to secure a CDL Passenger endorsement, it's recommended to have training for the best chance of passing the written and skills tests. Experience driving commercial vehicles can also be beneficial. Studying the passenger transport section of the Oklahoma CDL manual is crucial to understand regulations and safety procedures.
Yes, to obtain a CDL Passenger endorsement in Oklahoma, you must pass the Passenger endorsement written test. This test covers topics such as vehicle inspection, loading and trip start, on the road, after-trip vehicle inspection, prohibited practices, and use of brake-door interlocks. No additional road skills test is required for this endorsement.
During the CDL Passenger endorsement assessment, you'll need to demonstrate skills such as proper pre-trip inspection, safe loading and unloading of passengers, use of emergency exits, responding to emergency situations, and safely navigating the vehicle on the road. You'll also need to show proficiency in driving in various conditions and handling different passenger scenarios.
No, you cannot legally transport passengers in Oklahoma without a valid CDL Passenger endorsement. This endorsement is required for drivers who wish to operate a vehicle that can carry 16 or more passengers, including the driver. Driving such a vehicle without the appropriate endorsement can result in penalties, including fines and suspension of driving privileges.
Yes, you can add a CDL Passenger endorsement to your existing commercial driver's license in Oklahoma. You don't need a new application. You'll need to pass the Passenger endorsement written test and pay the required fees. Once you've passed, the endorsement will be added to your current CDL.
Yes, there are certain restrictions for drivers with a CDL Passenger endorsement in Oklahoma. Drivers must not have any serious traffic violations within the past two years. They are also required to pass a background check and must not have any prior disqualifying criminal offenses. Additionally, drivers are expected to maintain a high level of safety and compliance with all transportation regulations.
Yes, in Oklahoma, to obtain a CDL Passenger endorsement, you must be at least 21 years old. This is because interstate driving is often involved when transporting passengers, and federal regulations mandate a minimum age of 21 for interstate commercial driving. So, you must meet this age requirement before you can apply for the endorsement.
With a CDL Passenger endorsement in Oklahoma, you will be eligible to operate vehicles designed to transport 16 or more passengers, including the driver. This includes buses, vans, and other vehicles used for public transportation or for-hire transportation services. The endorsement is required if you plan to operate a commercial vehicle that falls into this category.
