Double #2
Double Triple Test | Texas 2026 #2 Page 3 of 3
Train for FREE with our Texas CDL double triple practice test online. 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 TX CDL double triple 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 may vary from state to state.
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15 . If you plan to slow down, you can warn drivers behind you by:
Putting your hand out the driver's side window and waving.
Before slowing down, it is a good idea to flash your brake lights by lightly tapping your brake pedal a few times. This will warn drivers behind you of your plans to slow down.
16 . To release a dolly's air brakes before positioning the converter dolly for coupling, you should:
Remove the pintle hook.
If a converter dolly has air brakes, you can release the brakes by opening the dolly air tank petcock. Releasing the dolly's brakes is the first step you should take when properly positioning the dolly in front of the rear trailer.
17 . Look for matching colors when coupling glad hands. Service lines are often:
Blue.
When coupling glad hands, make sure to couple together matching glad hands. To help drivers avoid mistakes, color coding is sometimes used. Service lines are often coded with the color blue and emergency lines are often coded with the color red.
18 . In a set of doubles, the shut-off valves at the rear of the first trailer should be:
Open.
When operating a double or triple, the shut-off valves at the rear of the last trailer should be closed. All other shut-off valves should be open.
19 . The emergency brake system uses:
Only parts unique to the emergency brake system.
In an air brake system, there are three different braking systems: a service brake system, a parking brake system, and an emergency brake system. The emergency brake system uses parts of both the parking and service brake systems.
20 . If you must drive in reverse, it is helpful to:
Stick your head out the window and look backward.
If you must drive in reverse, you should first walk around the vehicle to check for hazards in your path of travel. Make frequent use of the mirrors on both sides of your vehicle while backing. Always back up as slowly as possible.
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2026 Texas | Frequently Asked Questions
To acquire a CDL Hazmat endorsement in Texas, you must first have a Commercial Driver's License (CDL). Then, pass the Hazardous Materials Endorsement Knowledge Test at a Texas Department of Public Safety office. After passing, you'll need to undergo a TSA background check. Once cleared, the endorsement will be added to your CDL.
To obtain a CDL Hazmat license, you must first hold a valid Commercial Driver's License (CDL). You must be at least 21 years old and have a clean driving record. You'll also need to pass the Hazardous Materials Endorsement Knowledge Test and undergo a TSA background check. Good vision and physical health are also prerequisites.
When applying for a CDL Hazmat endorsement, you will need your current CDL, proof of U.S. citizenship or legal status (like a birth certificate or green card), and proof of identity and Texas residency. You'll also need your Social Security card and a completed Application for Texas Driver License or Identification Card. Lastly, you'll need to pass a TSA background check.
Yes, there is a dedicated written test for the CDL Hazmat endorsement. Called the Hazardous Materials Endorsement Knowledge Test, it covers topics like loading and unloading hazardous materials, bulk packaging marking, driving and parking rules, and emergency response procedures. This test must be passed to obtain the Hazmat endorsement.
The written test for the CDL Hazmat endorsement covers a range of subjects related to hazardous materials. These include recognizing hazardous materials, safe loading and unloading procedures, proper use of placards and labels, emergency response procedures, driving and parking rules for hazardous materials, and understanding the associated risks and regulations.
Yes, acquiring a CDL Hazmat endorsement comes with additional charges. These include a fingerprinting fee for the required TSA background check, and an endorsement fee. The exact costs can vary, so it's recommended to check with your local Department of Motor Vehicles (DMV) or similar agency for the most accurate information.
Yes, obtaining a CDL Hazmat endorsement requires a background check and security clearance. The Transportation Security Administration (TSA) conducts the check, which includes fingerprinting and a review of criminal, immigration, and terrorism records. This process is necessary to ensure the safety and security of hazardous materials transportation.
Yes, specialized training is required for the CDL Hazmat endorsement. Applicants must pass a written test, and in some cases, a driving test with a vehicle that carries hazardous materials. Once passed, this endorsement is added to your Commercial Driver's License (CDL). Regular renewal of this certification is also required.
No, you cannot legally transport hazardous materials without a valid Commercial Driver's License (CDL) with a Hazardous Materials (Hazmat) endorsement in the United States. This requirement ensures that drivers have the necessary training and knowledge to handle such materials safely, protecting public safety and the environment.
Yes, you can add the CDL Hazmat endorsement to your current CDL. You don't need to apply for a new CDL. However, you must pass the Hazmat knowledge test, undergo a TSA background check, and pay the required fees. Once completed, the endorsement will be added to your existing CDL.
