FREE CDL Combination Vehicles Practice Test Online | Illinois 2024 Page 2 of 3
Train for FREE online with our Illinois 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 IL combination license in 2021, 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 . When the wheels of a trailer lock up:
They will likely go flat.
A trailer may swing out and strike other vehicles if its wheels lock up. This is especially likely with lightly-loaded trailers.
9 . 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.
10 . How many air lines does a combination vehicle have?
Four
Every combination vehicle has two air lines: the service line and the emergency line.
11 . To prevent a rollover, cargo should be:
Loaded with most weight on the driver’s side of a trailer.
To reduce the risk of rollover, the weight of cargo in a trailer should be centered and spread out as much as possible. The weight of the cargo should also be kept as low to the ground as possible.
12 . Avoid needing to make sudden lane changes by:
Pulling off the road and waiting when there is high traffic.
Making a sudden lane change can be dangerous when driving a combination vehicle. Avoid the need to make a sudden lane change by looking down the road for upcoming obstacles that will require you to change lanes.
13 . Proper coupling technique:
Can be learned over time.
Knowing proper coupling and uncoupling technique is fundamental to the safe operation of combination vehicles. Improper coupling can be very dangerous.
14 . The best way to recognize that your trailer has begun to skid is by:
Listening to the radio.
