Combination #1

Combination Vehicles Practice Test | Michigan 2025 #1 Page 2 of 3

Train for FREE online with our Michigan 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 MI combination license in 2025, practice as much as.. Read More

Train for FREE online with our Michigan 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 MI 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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8 . A driver should test the tractor protection valve by:

You should test the tractor protection valve by allowing the air supply to properly charge, turning off the engine, then releasing air from the system by pressing the brake pedal several times. The tractor protection valve should move into its emergency position when psi drops to an unsafe level.

9 . Trailers built before ____ are not required to have spring brakes.

Trailers built before 1975 are not required to have spring brakes. When parking a trailer without spring brakes, be sure to use wheel chocks to prevent the trailer from rolling.

10 . What is a bobtail tractor?

Tractors without semi-trailers are referred to as bobtail tractors. Operating a bobtail tractor requires drivers to exercise caution.

11 . During a trip, landing gear should be:

Landing gear, or trailer supports, should always be completely raised before a vehicle is driven. Landing gear that is not entirely raised could catch on railroad tracks or other hazards on the roadway.

12 . If you press the tractor air supply control and your trailer's spring brakes do not release, you should:

It is important that all of a vehicle's equipment is in proper working condition before beginning 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.

13 . A trolley valve:

The trailer hand valve (also referred to as the trolley valve or Johnson bar) is a mechanism that works the trailer brakes. It should only be used to test the brakes. Using it while the vehicle is being driven could cause a skid. Never use the trailer hand valve while parking because doing so may release the air pressure from the braking system, releasing the brakes that are holding the vehicle in place.

14 . When backing up while coupling a trailer, the tractor should be positioned:

When backing up to couple a trailer, you should position the tractor directly in front of the trailer. Trying to couple while backing at an angle could cause the trailer to move and the landing gear to break.

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2025 Michigan | Frequently Asked Questions

To secure a CDL Doubles/Triples endorsement in Michigan, you must already possess a Commercial Driver's License (CDL). Complete a written knowledge test at the Secretary of State office. After passing the test, the endorsement will be added to your CDL. Remember, it's necessary to have a 'T' endorsement to pull double or triple trailers.
To obtain a CDL Doubles/Triples endorsement, you must: 1) Already hold a Commercial Driver's License (CDL), 2) Pass a written knowledge test about the specific skills and knowledge required for driving double and triple trailers, 3) Pay the necessary fees. Once you pass the test, the 'T' endorsement will be added to your CDL.
While specialized experience or training is not a mandatory requirement for a CDL Doubles/Triples endorsement, it is highly recommended. The endorsement test covers specific knowledge about handling double and triple trailers. Therefore, practical experience or training can be beneficial in successfully passing the test and safely operating such vehicles on the road.
Yes, to obtain a CDL Doubles/Triples endorsement, you are required to pass a written knowledge test. This test includes questions about coupling and uncoupling, inspecting doubles and triples, and rules for pulling these types of vehicles. After passing this test, the 'T' endorsement is added to your Commercial Driver's License (CDL).
The CDL Doubles/Triples endorsement test is a written exam, not a driving test, so no specific maneuvers are required. However, the test covers topics like coupling and uncoupling, inspecting doubles and triples, and rules for pulling these vehicles. Knowledge of these areas is essential to pass the test and safely operate such vehicles.
No, it is not permissible to operate double or triple trailers without a valid CDL Doubles/Triples endorsement in Michigan. Driving these types of vehicles requires specialized skills and knowledge, which are validated by obtaining the endorsement. Operating without the proper endorsement can lead to fines, penalties, and potential loss of your CDL.
You can add the CDL Doubles/Triples endorsement to your existing commercial driver's license in Michigan. You don't need to initiate a new application for a license. However, you must pass the required knowledge test for the endorsement and pay any applicable fees to add it to your current license.
Yes, there are limitations for drivers with a CDL Doubles/Triples endorsement. The most notable is that the endorsement only allows you to operate double or triple trailers. Additionally, all standard CDL rules and restrictions still apply, such as obeying traffic laws, maintaining a clean driving record, and passing regular medical examinations to ensure fitness for driving.
In Michigan, the maximum weight for a double/triple trailer is 164,000 pounds, depending on the number of axles and bridge length. The maximum length for a trailer is 53 feet. However, the combined length of a double/triple trailer cannot exceed 59 feet. Please note that these restrictions may vary based on local and federal regulations.
Yes, there are specific safety guidelines for driving double/triple trailers with a CDL Doubles/Triples endorsement. These include maintaining safe following distances, proper coupling and uncoupling of trailers, checking brake systems and lights, and managing high-speed and high-wind conditions. Drivers must also undergo regular drug and alcohol tests as per federal regulations.

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