Truckcess is an FMCSA-registered ELDT theory provider. Study for your CDL with real practice questions, an interactive pre-trip inspection trainer, and federally registered theory training — reported straight to the FMCSA when you finish.
Sample CDL practice questions
For a CDL, at what blood alcohol concentration (BAC) is a driver considered to be driving under the influence?
Answer: 0.04%
Commercial drivers are held to a stricter standard: 0.04% BAC is the legal limit for operating a CMV — half the 0.08% limit used for most passenger-vehicle drivers.
Roughly how much following distance should you keep at speeds under 40 mph?
Answer: 1 second per 10 feet of vehicle length
The rule of thumb is at least 1 second for each 10 feet of vehicle length below 40 mph. Above 40 mph, add 1 more second. A 60-ft rig at highway speed needs about 7 seconds.
What is the most important reason for doing a vehicle inspection?
Answer: Safety — for yourself and other road users
Inspections exist for safety. A defect you catch in the yard is far cheaper — and safer — than one that fails at 65 mph or gets you placed out of service at a roadside inspection.
On a long, steep downgrade, what should provide your primary braking?
Answer: The engine, by selecting a low gear
Engine braking in a proper low gear does the main work on a downgrade; the service brakes are used to supplement. Riding the brakes the whole way overheats them and can cause brake fade.
What is the leading cause of tire failure?
Answer: Under-inflation
Under-inflation is the most common cause of tire failure. It builds heat, wears the tire unevenly, and can lead to a blowout. Check pressures cold and often.