GK
General Knowledge
The test every CDL applicant takes first.
- —Stopping distance and speed management
- —Following distance and space cushions
- —Hazardous locations and railroad crossings
50 questionsDetails
The catalogue
Pick the exam you're sitting
Each bank is 30 questions drawn from the material your state handbook covers, with the reasoning written under every answer. Buy one, or take all five together.
$19
B
Air Brakes
Removes the air-brake restriction — and it's the one people fail.
- —Dual air systems and reservoirs
- —Low-pressure warning and spring brakes
- —Compressor cut-in and cut-out pressures
50 questionsDetails
P
Passenger (P)
For buses, shuttles, and anything carrying people.
- —Standee line and standing passengers
- —Loading, unloading, and door discipline
- —Emergency exits and passenger briefing
50 questionsDetails
H
HazMat (H)
Placards, papers, and the rules that keep you out of trouble.
- —Placard requirements and placement
- —Shipping papers and emergency response info
- —Hazardous materials table columns
50 questionsDetails
N
Tanker (N)
Surge, balance, and why tankers roll.
- —Liquid surge and its effect on braking
- —Out-of-balance and out-of-control conditions
- —Baffled versus smooth-bore tanks
50 questionsDetails
5 banks · 250 questions
Complete CDL Prep Bundle
Every exam bank, one price. Unlimited retakes on every exam, and your results break down by topic so you know what to re-read.
$59$95
Not sure which one you need? General Knowledge is required for every CDL. Air Brakes removes the B restriction. Passenger (P), HazMat (H), and Tanker (N) are endorsements you add on top. More on how these fit together.