Commercial Driver's License Flashcards

In Alabama, what is the minimum age to obtain a CDL for interstate commerce?

Answer: 21 years old

Drivers must be at least 21 to operate a commercial vehicle across state lines, though 18-year-olds may drive intrastate.

A Class A CDL is required to operate a combination vehicle with a GCWR of 26,001 pounds or more when the towed unit weighs more than how much?

Answer: 10,000 pounds

Class A applies when the towed unit exceeds 10,000 pounds GVWR and the combination exceeds 26,001 pounds GCWR.

When performing a pre-trip inspection, what should tire tread depth be on the front (steering) tires?

Answer: At least 4/32 inch

Front steering tires must have at least 4/32-inch tread depth, while other tires need at least 2/32 inch.

What is the maximum blood alcohol concentration (BAC) allowed for a CDL holder operating a commercial motor vehicle?

Answer: 0.04%

CDL holders are held to a stricter 0.04% BAC limit while operating a commercial motor vehicle, half the standard limit.

If you are convicted of a first offense of driving a CMV under the influence, how long will your CDL be disqualified?

Answer: 1 year

A first DUI conviction in a CMV results in a one-year CDL disqualification, or three years if hauling hazardous materials.

How far ahead should you look while driving a commercial vehicle at highway speeds?

Answer: 12 to 15 seconds

Looking 12 to 15 seconds ahead, about a quarter mile at highway speed, gives you time to react to hazards.

Which endorsement is required to transport hazardous materials requiring placards in Alabama?

Answer: H endorsement

The H endorsement, which requires a TSA background check and knowledge test, is needed to haul placarded hazardous materials.