Combination #1
Combination Vehicles Practice Test | Colorado 2026 #1
Train for FREE online with our Colorado 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 CO 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 . Before backing your tractor under the trailer, make sure your trailer brakes are:
Dry.
Correctly following the steps to couple and uncouple trailers is vital to safely operating a combination vehicle. Before backing your tractor under the trailer while coupling, make sure your trailer brakes are locked.
2 . Using the trailer hand brake while experiencing a trailer jackknife will:
Continue the skid.
If you are experiencing a trailer jackknife, you can help your tires regain traction by releasing the brakes. Using a trailer hand brake while experiencing a skid will only cause the skid to continue.
3 . Rollovers happen when drivers:
Drive illegally.
A rollover happens as a result of a driver taking a turn at too high a speed. Be sure to take turns and curves safely and slowly.
4 . An air supply control lever should be in its "normal" position when you are:
Using your spring brakes.
Tractor protection controls in older vehicles may be operated by levers instead of knobs. If an air supply control is set in its "normal" position, it is properly set for you to pull a trailer.
5 . Fully-loaded rigs:
Should not be driven.
Because the weight of cargo gives them a higher center of gravity, fully-loaded rigs are 10 times more likely to roll over in a crash than empty rigs.
6 . What is a tractor protection valve?
A valve that prevents the trailer from accidentally being released
In a combination vehicle with air brakes, the tractor protection valve keeps air in the tractor or truck brake system in the event of the trailer breaking away or developing a leak.
7 . Simply changing lanes can cause:
Other drivers to reduce their speed.
Due to the "crack-the-whip" effect caused by rearward amplification, changing lanes too quickly in a combination vehicle can result in a rollover.
2026 Colorado | Frequently Asked Questions
To acquire a CDL Tank endorsement in Colorado, you must first hold a valid Colorado CDL. Then, you need to pass the Tank Vehicles endorsement test which covers the proper handling and inspection of tank vehicles. The test is administered by the Colorado DMV. Studying the Colorado Commercial Driver's Handbook will help you prepare for the exam.
To obtain a CDL Tank license, you first need a Commercial Driver's License (CDL). Then, study the Tank Vehicles section of your state's CDL handbook. You must pass the Tank Vehicles endorsement written test at your local DMV. Upon passing, the endorsement is added to your CDL. Always check specific state requirements as they may vary.
While specific training is not mandatory for a CDL Tank endorsement in Colorado, it is highly recommended to thoroughly understand the handling of tank vehicles. Experience is not required either, but you must hold a valid Colorado CDL and pass the Tank Vehicles endorsement test conducted by the Colorado DMV.
Yes, to obtain a CDL Tank endorsement in Colorado, you must pass the Tank Vehicles endorsement test. This written exam covers the specific knowledge needed for driving tank vehicles, including handling and inspection. The test is administered by the Colorado DMV and studying the Colorado Commercial Driver's Handbook can help you prepare.
The written test for a CDL Tank endorsement in Colorado covers topics such as inspecting tank vehicles, safe driving for tank vehicles, and understanding the effects of liquid surge on vehicle handling. It also includes the importance of baffle usage in tanks, and knowledge about different types of tanks.
The CDL Tank endorsement assessment doesn't involve a specific driving test or maneuvers. However, it evaluates your knowledge on safely handling tank vehicles. This includes understanding the vehicle's high center of gravity, managing liquid surge, conducting proper inspections, handling emergencies, and understanding the differences between various tank types.
Drivers with a CDL Tank endorsement must comply with strict safety regulations due to the potentially hazardous materials they may transport. They must understand how to control surge, inspect their vehicle, and handle emergencies. Additionally, they may need a Hazardous Materials (HazMat) endorsement if transporting hazardous liquids. Violation of regulations can result in endorsement suspension or revocation.
No, a valid CDL Tank endorsement is required to legally transport liquid or gas materials in Colorado. This endorsement ensures drivers have the necessary skills and knowledge to handle such materials safely. Driving without the proper endorsement can result in serious penalties, including fines and suspension of your commercial driving license.
The CDL Tank endorsement can be added to your existing Commercial Driver’s License. However, you will need to pass a specific knowledge test related to tank vehicles. Once you pass the test, the endorsement will be added to your CDL, and no fresh application for a new license is necessary.
Yes, there are specific regulations in place. For handling hazardous materials with a CDL Tank endorsement, you also need a Hazardous Materials (HazMat) endorsement. This involves passing a written test and a TSA background check. Also, you must follow FMCSA regulations for the safe transport of hazardous materials to prevent accidents and spills.