Combination #1
Combination Vehicles Practice Test | Missouri 2026 #1
Train for FREE online with our Missouri 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 MO combination license in 2026, 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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1 . 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.
2 . In a double or triple combination, the ____ trailer should be directly behind the cab.
When positioning trailers in a combination, the most heavily-loaded trailer should be the closest to the tractor. The lightest trailer should be positioned in the rear.
3 . How much space should be between the upper and lower fifth wheel?
Before a trip, be sure to inspect all couplings. There should be no space between the upper and lower fifth wheel.
4 . When coupling, you should:
When coupling air brake hoses, you should make sure the proper pairs of gland hands are connected. They are sometimes color-coded to help drivers avoid mistakes. Typically, blue is used for service lines and red is used for emergency lines.
5 . Shut-off valves:
Shut-off valves are used in air supply lines to control the passage of air from one trailer to another. The rear shut-off valve should always be closed to prevent air from leaving the braking system.
6 . 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.
7 . If color-coded, which color is used to identify service lines?
Air lines are sometimes color-coded to help drivers avoid mistakes when coupling glad hands. Typically, blue is used for service lines and red is used for emergency lines.
See the exact questions that will be on the 2026 Missouri DMV exam.
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2026 Missouri | Frequently Asked Questions
To secure a Doubles/Triples endorsement for your CDL in Missouri, you'll need to pass the Doubles/Triples Knowledge Test. This involves studying the relevant section in the Missouri CDL manual. After passing, you'll receive the endorsement on your CDL. Note, having a valid CDL and being at least 18 years old are prerequisites.
To obtain a CDL Doubles/Triples license, you must already have a valid CDL. You'll need to pass the Doubles/Triples Knowledge Test, which includes questions on coupling/uncoupling, inspecting doubles/triples, and handling. Study materials can be found in the CDL manual. Applicants must be at least 18 years old and meet all physical requirements.
No specialized experience or training is legally required for a CDL Doubles/Triples endorsement in Missouri. However, you must pass the Doubles/Triples Knowledge Test. Studying the relevant sections in the Missouri CDL manual can help prepare you. Practical experience or training in handling doubles/triples can be beneficial but isn't mandatory.
Yes, to receive a CDL Doubles/Triples endorsement in Missouri, you must take and pass the Doubles/Triples Knowledge Test. This test covers specific knowledge areas including coupling and uncoupling, inspecting doubles/triples, and handling of these types of vehicles. No additional driving skills test is required for this endorsement.
For the CDL Doubles/Triples endorsement in Missouri, there's no specific driving skills test. However, the Doubles/Triples Knowledge Test covers areas like coupling and uncoupling, inspecting doubles and triples, and handling these vehicles. It's important to understand these aspects theoretically, even though you don't have to demonstrate them practically for the test.
No, it is not permissible to operate double/triple trailers without a valid CDL Doubles/Triples endorsement in Missouri. Driving such vehicles without the proper endorsement is considered illegal and may lead to penalties, fines, or suspension of your commercial driving license. Always ensure you have the correct endorsements for the vehicle you are operating.
You can append the CDL Doubles/Triples endorsement to your current CDL. You don't need to initiate a new application for a CDL. However, you will need to pass the Doubles/Triples endorsement written test and pay the required fee to add this endorsement to your existing license in Missouri.
Yes, there are limitations for drivers holding a CDL Doubles/Triples endorsement in Missouri. Drivers must not exceed the maximum length and weight limits for double/triple trailers. They should also have a good driving record, pass the required knowledge tests, and maintain their physical health to meet the demands of driving larger, more complex vehicles.
The maximum weight for a double trailer in Missouri is 80,000 lbs and the maximum length is 81.5 feet. For triple trailers, the maximum gross weight is also 80,000 lbs, but the maximum length varies. It's important to note that these restrictions can change and it's recommended to check with local authorities for the most current regulations.
Yes, there are specific safety guidelines. Drivers must ensure proper coupling and uncoupling of trailers, correctly distribute the weight for safe handling, check all brake connections and trailer height before driving. Additionally, they must maintain a safe following distance, manage high-speed risks, and monitor the effect of wind and other weather conditions on the vehicle.
