California DMV CDL General Knowledge Quick Practice Test 4

California DMV CDL General Knowledge Quick Practice Test 4 For 2026

CDL Class A, B or C. Complete CDL driver training course. All the questions in this test are from the official DMV written exam. You can use our free online tests to evaluate how likely you are to pass the official DMV test. Or you can just cut to the chase and increase your chances of passing by upgrading to Premium Membership and unlock official DMV tests. In addition, you will also receive a master cheat sheet which contains all your state’s DMV questions and answers. Premium membership also unlocks a smart tracker which keeps an inventory of all incorrectly answered questions for easy, fast and effective revision. Practice with our free tests or hit Upgrade button below for premium access and increase your chances of passing your DMV written exam.

99.5% Pass Rate

Get Access To Official DMV Online Tests & A Master Cheat Sheet With All Questions & Answers For Your State. 99.5% Pass Rate Guaranteed!

Upgrade To Premium

Quick Facts:

Number of Questions – 20

Passing Percentage – 80%

Test Type – Free Test

1. When encountering fog, you will be safest if you:

Stay in the left lane.
Don’t drive in the fog.
Use your low beam lights.
Follow the vehicle ahead of you closely.

2. When driving, being aware of what is happening behind you is:

Not important.
Important.
Distracting.

3. Spring brakes come on:

When too much air pressure is lost.
When a control on the dashboard is activated.
When the tires have minimal tread depth.
When the brakes are noisy.

4. On trucks and buses, where are ABS malfunction lamps located?

On the driver’s door
On the instrument panel
On the outside of the vehicle by the passenger’s door
Under the hood

5. Talking on a hands-free cell phone:

Is not a distraction from driving.
Can be a distraction from driving.
Allows the driver to eat while driving.

6. What do headers do?

Protect the driver during a crash
Provide a place for storage
Ensure that controls are accessible
Act as wind guards

7. When checking your tires, which of the following is not an issue to correct?

Too much air pressure
Too little air pressure
Radial and bias-ply tires used together
Tread depth of at least 4/32 of an inch on the front tires

8. Be sure you are always driving so your vehicle can stop:

Within 10 feet of your current position.
Within 1,000 feet of your current position.
Within your view of the road ahead.
Immediately.

Page 1 of 3