How Many Questions Are on the Texas CDL General Knowledge Test?
50 questions, 40 correct to pass — Texas DPS uses the same federally influenced CDL general knowledge format as most other states, though one recent change is worth knowing about before you book your appointment.
English-only testing as of 2026
As of June 1, 2026, Texas DPS administers all CDL and commercial learner's permit knowledge exams in English only, a rule change aligned with FMCSA's English-language-proficiency requirements for commercial drivers — a shift from how the test previously ran.
The skills tests (pre-trip inspection, basic control skills, road test) are conducted in English as well, so this affects the whole testing process, not just the written portion.
What the 50 questions actually cover
Every CLP and CDL applicant takes the general knowledge test regardless of vehicle class, drawing on the Texas Commercial Driver Handbook and FMCSA's federal standards: vehicle inspection, basic vehicle control, air brakes, cargo securement, and related core topics.
Endorsements like hazardous materials, passenger transport, tank vehicles, or doubles/triples each require their own separate knowledge test on top of the general knowledge exam.
How our practice tests are structured
dmvwrittenexam.com splits 100 original Texas CDL questions across 17 topic areas into four 25-question practice tests, so you can work through the full range in focused sessions rather than one long sitting.
Every question comes with a full explanation and source reference, so you learn the underlying reasoning rather than memorizing a pattern that won't hold up if the real question is worded differently.
Frequently Asked Questions
Can I take the Texas CDL test in a language other than English?
No — as of a June 1, 2026 rule change, Texas DPS administers all CDL knowledge and skills tests in English only, to align with federal English-proficiency requirements.
Do I need to pass additional tests beyond the general knowledge test?
Yes, if you're pursuing a specific vehicle class or endorsement (like hazardous materials or passenger transport), you'll need to pass additional knowledge tests specific to that endorsement, plus a skills test.
Does the CDL test cover air brakes even if my vehicle doesn't have them?
Air brake questions are commonly included in the general knowledge test because air brakes are widely used across commercial vehicles. Restrictions may apply to your CDL if you test in a vehicle without air brakes; confirm current rules with Texas DPS.
Ready to put this into practice?
Start a free Texas cdl practice testLast reviewed: 2026-07-14