Combination #2
Combination Vehicles Practice Test | Indiana 2026 #2 Page 3 of 3
Train for FREE online with our Indiana 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 IN 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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15 . What happens when the wheels of a trailer lock up?
The trailer will stop.
A trailer tends to swing around, potentially resulting in a trailer jackknife, if its wheels lock up.
16 . The trailer hand valve should:
Be used on slippery surfaces.
The trailer hand valve works the trailer brakes but should only be used when testing them. Using it while driving could create 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.
17 . What is the Johnson bar?
A valve that allows for the release of excess pressure in the braking system
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.
18 . The trailer hand valve:
Should only be used when transporting cargo.
The trailer hand valve should not be used for parking. This could cause all of the air to leak out of the braking system, resulting in the brakes releasing. Instead, use the parking brake.
19 . Which of the following types of vehicles is most prone to the “crack-the-whip" effect?
A triple combination
Double and triple combinations are the most vulnerable to turning over as a result of the "crack-the-whip" effect.
20 . ____ are the cause of more than half of all accident-related truck driver deaths.
Pedestrians
More than half of all accident-related truck driver deaths are a result of truck rollovers. To help prevent a rollover, be sure to load cargo low to the ground and centered on your rig. Take corners slowly and carefully.
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2026 Indiana | Frequently Asked Questions
To secure a CDL Doubles/Triples endorsement in Indiana, you must already have a valid CDL. Then, you'll need to pass the Doubles and Triples Endorsement Knowledge Test. This test covers topics like coupling and uncoupling, inspecting doubles and triples, and handling. After passing the test, you can add the endorsement to your CDL.
To obtain a CDL Doubles/Triples license, you must first have a Commercial Driver's License (CDL). You are then required to pass the Doubles/Triples Endorsement Knowledge Test. This test includes understanding of coupling and uncoupling, inspecting doubles and triples, and handling these vehicles. After successfully passing the test, you can add the endorsement to your CDL.
While Indiana does not specifically require specialized experience or training for a CDL Doubles/Triples endorsement, it's beneficial to have training in handling these types of vehicles. You must pass the Doubles/Triples Endorsement Knowledge Test, which covers topics like coupling and uncoupling, and inspecting doubles and triples. So, practical experience or training would help you pass the test.
Yes, to receive a CDL Doubles/Triples endorsement in Indiana, you must pass the Doubles/Triples Endorsement Knowledge Test. This written exam covers topics such as coupling and uncoupling, inspecting doubles and triples, and the proper procedures for driving these types of vehicles. After passing the test, you can add the endorsement to your CDL.
There's no specific skills test or maneuvers to showcase for the CDL Doubles/Triples endorsement. However, you need to pass the Doubles/Triples Endorsement Knowledge Test. This test evaluates your understanding of coupling and uncoupling, inspecting doubles and triples, and handling these vehicles. The CDL handbook provides all the necessary information for this test.
No, it's not permissible to operate double or triple trailers in Indiana without a valid CDL Doubles/Triples endorsement. Operating these types of vehicles requires specific skills and knowledge, which are tested during the endorsement process. Driving without the proper endorsements can result in significant fines and penalties, including the suspension of your CDL.
Yes, you can append the CDL Doubles/Triples endorsement to your current Commercial Driver's License (CDL). You don't need to initiate a new application for a CDL, but you will need to apply for the endorsement, pass the knowledge test, and pay any associated fees to receive the endorsement on your existing CDL.
Yes, there are limitations. Drivers with a CDL Doubles/Triples endorsement must adhere to specific rules, including maximum weight limits for trailers and load. They also need to follow rules related to coupling and uncoupling, and inspecting the doubles/triples. Additionally, they must not operate vehicles that exceed the endorsement's specifications. Violating these regulations can lead to penalties or loss of endorsement.
In Indiana, a semi-trailer's maximum length is 53 feet, and the combined length should not exceed 65 feet. For weight, a vehicle with a single or tandem axle can weigh up to 20,000 or 34,000 pounds respectively. The gross vehicle weight (including all trailers) should not exceed 80,000 pounds. These limits may vary depending on specific roads or bridges.
Yes, there are specific safety guidelines. Drivers must check that all couplings are secure, ensure the heaviest trailer is directly behind the truck, and maintain a safe following distance. Additionally, they must take extra care while turning due to off-tracking and avoid sudden lane changes or braking which could cause jackknifing. Regular vehicle inspections are also mandated.
