Double Triple Test | Illinois 2026 #2

Train for FREE with our Illinois 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 IL 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.

Number of Question 20

Passing Score 16

Number of Tests 20

1 . If you see lights ahead while driving in fog:

You can assume the lights are on the road.

It may be a reflection.

It may be an optical illusion.

The lights may not indicate where the road is as the vehicle may have pulled off the roadway.

When driving under foggy conditions, lights cannot be taken as a reliable indication of where the road is. The lights may be coming from a vehicle that has pulled off the road.

2 . Before entering a curve, you should:

Upshift.

Speed up.

Drive on the shoulder.

Downshift.

Always downshift before entering a curve. Decreasing your speed before entering the curve will allow you to maintain better control over the vehicle throughout the curve.

3 . Why should rental trucks be approached with caution?

It is a rental vehicle, so it likely isn’t insured.

Drivers are usually worried about their cargo.

Drivers may not be familiar with the limited views to the sides and rear.

They do not respond to the driver as well as other vehicles.

You should be cautious when driving near rental trucks because the people driving them may not be used to operating vehicles with limited views to the sides and rear. Drivers who cannot see others on the roadway are hazardous.

4 . Without oil in its engine:

A vehicle will likely run smoothly.

A vehicle will make quick jerks while driving.

A vehicle's engine may be damaged quickly.

A vehicle's gas mileage will improve.

An engine can be rapidly destroyed if it is run without oil. If its oil pressure gauge is low or fluctuating, do not operate a vehicle.

5 . If colors are being used to distinguish glad hands, which color is used for service lines?

Orange

Yellow

Green

Blue

When trailer air lines are color-coded, the service lines are generally blue and the emergency lines are generally red.

6 . When inspecting the engine compartment, you should not:

Check the engine oil level.

Check the coolant level in the radiator.

Drain the brake fluid.

Check the windshield washer fluid level.

When inspecting the engine compartment, you should check the oil level, coolant level, and windshield washer fluid level, among other things.

7 . Brake fade is a result of:

Exposure to sunlight.

Exposure to moisture.

Excessive use.

Not using the brakes enough.

If brakes are used too much, they will overheat and become less effective. This is referred to as brake fade.

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2026 Illinois | Frequently Asked Questions

To acquire a CDL Tank endorsement in Illinois, you must first have a Commercial Driver's License (CDL). Next, study the Tank Vehicles section of the Illinois Commercial Driver's License Study Guide. Once prepared, schedule and pass the written tank vehicle endorsement test at a Secretary of State Driver Services facility. The endorsement will then be added to your CDL.

To obtain a CDL Tank license, it is essential to have a Commercial Driver's License (CDL) first. Then, you need to study the Tank Vehicles section of the Illinois Commercial Driver's License Study Guide. After studying, you must pass the written tank vehicle endorsement test at a Secretary of State Driver Services facility in Illinois.

While specific training or experience isn't legally mandatory for a CDL Tank endorsement in Illinois, it is highly recommended. Understanding the operation of tank vehicles and handling of liquid cargo is crucial. Studying the Tank Vehicles section of the Illinois Commercial Driver's License Study Guide and passing the written test at a Secretary of State Driver Services facility is required.

Yes, to obtain a CDL Tank endorsement in Illinois, you must pass an additional written test. This test covers specific knowledge related to the safe transport of liquid and gaseous materials in tank vehicles. The information for the test can be found in the Tank Vehicles section of the Illinois Commercial Driver's License Study Guide.

The written test for the CDL Tank endorsement in Illinois covers various subjects including: high and low center of gravity and its impact on vehicle stability, how to inspect tank vehicles, how to drive vehicles loaded with liquids or gases, and special safety considerations for hazardous materials. All these subjects are detailed in the Illinois Commercial Driver's License Study Guide.

The CDL Tank endorsement assessment evaluates your understanding of tank-specific operations. You'll be tested on handling liquid surge, inspecting tank vehicles, managing a high center of gravity, and the implications of carrying a full or partial load. However, it's primarily a knowledge test, so specific driving maneuvers aren't typically assessed in this endorsement.

Yes, drivers with a CDL Tank endorsement must comply with specific requirements and regulations. These include maintaining a clean driving record, undergoing regular medical examinations, and adhering to hours-of-service regulations. Additionally, drivers must follow safety procedures when loading and unloading tanks, and comply with hazardous materials transportation regulations if applicable.

No, you cannot legally transport liquid or gas materials without a valid CDL Tank endorsement in Illinois. This endorsement is necessary for operating a commercial vehicle designed to transport any liquid or gaseous materials within a tank or tanks having an individual rated capacity of more than 119 gallons and an aggregate rated capacity of 1,000 gallons or more.

Yes, the CDL Tank endorsement can be added to your current license in Illinois. You don't need to apply for a fresh license. However, you must pass the Tank Vehicle endorsement test. Once passed, the endorsement will be added to your existing CDL, allowing you to legally operate tank vehicles.

Yes, handling hazardous materials with a CDL Tank endorsement requires adherence to specific regulations. Drivers must pass the Hazardous Materials (HazMat) endorsement knowledge test, undergo a federal background check, and submit fingerprints. They must also follow safety protocols for loading and unloading hazardous materials, and comply with shipping paper requirements.