Combination #2
Combination Vehicles Practice Test | Louisiana 2025 #2 Page 3 of 3
Train for FREE online with our Louisiana 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 LA 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 . Before a trip, you can make sure air flows to all trailers by:
Before a trip, ensure that air in the air brake system reaches all trailers. Do this by waiting for air pressure to build, then sending air to both the emergency and service lines and opening the shut-off valves on the rear of the last trailer. If air escapes from the shut-off valves in the rear of the combination, the air is being supplied to the entire vehicle.
16 . The "crack-the-whip" effect can:
Trailers can overturn as a result of the "crack-the-whip" effect. The last trailer in a combination is the most prone to tip over due to this effect. Drivers should be aware of the rearward amplification of their specific vehicles and drive accordingly.
17 . A tractor protection valve:
A tractor protection valve keeps air in a tractor or truck air brake system should the trailer break away or develop a bad leak. The valve will close automatically if the pressure drops to an unsafe level.
18 . When connecting a converter dolly to a second trailer, the trailer height should be ____ the center of the fifth wheel.
When connecting a converter dolly to a second or third trailer, the trailer height should correct. It should be slightly lower than the center of the fifth wheel.
19 . When should the trailer hand valve be used?
The trailer hand valve, also called the trolley valve or Johnson bar, is used to work the trailer brakes. It should be used only to test the brakes. Using it while a vehicle is in motion could cause a skid.
20 . The emergency air line supplies air to the:
The emergency air line (also known as the supply line) has two functions. The first is to supply air to the trailer air tanks, and the second is to control the emergency brakes on combination vehicles.
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2025 Louisiana | Frequently Asked Questions
To secure a CDL Bus endorsement in Louisiana, you must first hold a valid Commercial Driver's License (CDL). Next, you need to pass the Passenger Transport Test and the School Bus Endorsement Test. Additionally, you must complete a background check, physical exam, and a skills test in the type of bus you'll be driving. Check with the Louisiana Office of Motor Vehicles for specifics.
To obtain a CDL Bus License, you need a valid driver's license and must be at least 21 years old. You'll need to pass a series of written exams, including General Knowledge, Passenger Transport, and School Bus Endorsement tests. A physical exam is required, as well as a skills test in the type of bus you'll be driving. A background check is also necessary.
Yes, specific training is necessary for a CDL Bus endorsement. Applicants must complete a state-approved commercial driver's training course. This course includes both classroom instruction and practical skills training. After the course, applicants must pass a written knowledge test and a skills test, which includes vehicle inspection, basic controls, and on-road driving.
CDL Bus licenses fall under three main classifications: Class A, B, and C. Class A is for vehicles with a combined weight over 26,001 pounds, where the vehicle being towed is over 10,000 pounds. Class B is for single vehicles over 26,001 pounds or towing a vehicle not over 10,000 pounds. Class C is for vehicles designed to transport 16 or more passengers including the driver.
No, you cannot use your personal vehicle for the CDL Bus driving test. The vehicle you use for the test must match the type and class of CDL you are applying for. For a bus endorsement, you need to test in a bus of the appropriate size. The vehicle must also meet all legal requirements for safety and operation.
The CDL Bus driving test evaluates several skills. These include pre-trip vehicle inspection to ensure safety and roadworthiness, basic vehicle control tests such as backing up, and an on-road driving test. The on-road test assesses your ability to handle intersections, railway crossings, curves, and various types of traffic conditions. It also tests your knowledge of bus-specific laws and regulations.
Yes, there are additional medical requirements for a CDL Bus endorsement. Applicants must pass a Department of Transportation (DOT) physical examination every 24 months. This exam evaluates vision, hearing, blood pressure, and checks for conditions like diabetes and epilepsy that could interfere with safe driving. The results are documented on a DOT medical certificate.
No, it is not permissible to transport passengers without a valid CDL Bus endorsement in Louisiana. Operating a commercial vehicle such as a bus requires specific training and licensing. If you're caught driving without the appropriate endorsement, you could face heavy fines, license suspension, and even jail time. Always ensure your CDL endorsements are current and valid before driving.
Yes, the CDL Bus endorsement can be added to your existing Commercial Driver's License (CDL) in Louisiana. You will need to pass the passenger endorsement knowledge test, and if you're driving a school bus, you'll also need to pass the school bus endorsement test. No new application for a CDL is required, just the specific tests for the endorsement.
Yes, there are restrictions for drivers with a CDL Bus endorsement in Louisiana. Drivers must not have any serious traffic violations in the past three years. They must also pass a physical examination every two years and comply with drug and alcohol testing rules. Furthermore, bus drivers are required to maintain a logbook documenting their hours to ensure they do not exceed the maximum allowed driving hours.
