Who is ultimately responsible for the safe operation of a commercial vehicle after an inspection?
Correct answer: The driver
The driver remains responsible for operating the vehicle safely, even when maintenance personnel performed repairs.
Source: CA Commercial Driver Handbook § 2.1.2 Vehicle Inspection ↗
Which items should a commercial driver monitor during a trip for signs of trouble?
Correct answer: Gauges and the vehicle through sight, sound, smell, and feel
Trip inspection includes watching gauges and using the senses to detect developing problems.
Source: CA Commercial Driver Handbook § 2.1.2 Trip Inspection ↗
What minimum tread depth is required in every major groove of a commercial vehicle’s front tires?
Correct answer: 4/32 inch
Front tires require at least 4/32 inch; other tires require at least 2/32 inch.
Source: CA Commercial Driver Handbook § 2.1.3 Tire Problems ↗
Which tire placement is prohibited on the front wheels of a bus?
Correct answer: Regrooved, recapped, or retreaded tires
A bus may not use regrooved, recapped, or retreaded tires on its front wheels.
Source: CA Commercial Driver Handbook § 2.1.3 Tire Problems ↗
What can rust around a commercial vehicle’s wheel nuts indicate?
Correct answer: The nuts may be loose
Rust trails around wheel nuts can be evidence of movement and looseness.
Source: CA Commercial Driver Handbook § 2.1.3 Wheel and Rim Problems ↗
Why is excessive steering-wheel play a serious inspection defect?
Correct answer: It can make the vehicle difficult to steer
Excessive play can prevent precise steering control and must be investigated.
Source: CA Commercial Driver Handbook § 2.1.3 Steering System Defects ↗
Which warning equipment is a standard option for a parked commercial vehicle?
Correct answer: Three red reflective warning triangles
Commercial emergency equipment includes approved warning devices such as three red reflective triangles.
Source: CA Commercial Driver Handbook § 2.1.3 Emergency Equipment ↗
During the CDL vehicle inspection test, what must an applicant do when identifying an item?
Correct answer: Point to or touch it, name it, and explain why it is inspected
The inspection test requires identification of the component and an explanation of its safety purpose or condition.
Source: CA Commercial Driver Handbook § 2.1.4 CDL Vehicle Inspection Test ↗
What is the principal method for controlling speed on a long downgrade?
Correct answer: Use the engine’s braking effect in a suitable low gear
Selecting a low gear before descending lets engine braking control speed while preserving the service brakes.
Source: CA Commercial Driver Handbook § 2.6.6 Speed on Downgrades ↗
When should a commercial driver select the proper low gear for a downgrade?
Correct answer: Before starting down the grade
The gear must be selected before descending because shifting later may be unsafe or impossible.
Source: CA Commercial Driver Handbook § 2.6.6 Speed on Downgrades ↗
How should speed be chosen when fog or darkness limits the view ahead?
Correct answer: So the vehicle can stop within the visible distance
A driver must always be able to stop within the distance that can be seen clearly.
Source: CA Commercial Driver Handbook § 2.6.4 Speed and Distance Ahead ↗
Under the handbook length rule below 40 mph, what is the minimum following time for a 50-foot commercial vehicle?
Correct answer: 5 seconds
The basic minimum is one second per 10 feet of vehicle length: five seconds for 50 feet. Leave more space when road, traffic, or weather conditions require it.
Source: CA Commercial Driver Handbook § 2.7.1 Space Ahead ↗
