Most CDL guides just tell you to study the handbook. This guide tells you exactly what to expect when you sit down at the DPS computer — how many questions, which ones appear most often, what happens if you fail, and why the Texas exam is different from every other state.
⚠ The order is mandatory: Texas requires Special Requirements to be passed first. You cannot take General Knowledge, Air Brakes, or Combination Vehicles until Special Requirements is completed. If you fail Special Requirements, all testing ends for that day. As of June 1, 2026, all tests are in English only — no Spanish, no interpreters.
Texas CDL knowledge tests are administered on a computer at the DPS driver license office. There is no paper test. The format is multiple-choice with four options (A, B, C, D) for every question. You read the question on the screen and click your answer. The computer displays each question one at a time.
There is no published time limit. Most applicants complete the General Knowledge test in 60 to 90 minutes. If you need more time, take it — rushing is a leading cause of avoidable wrong answers. The DPS does not pressure you on timing.
The questions are drawn from a bank — not every applicant sees the exact same questions. The topics are consistent and everything comes from the DL-7C handbook, but the specific wording and which questions are selected from each topic area varies between test sessions. This is why thorough understanding of the material matters more than memorizing specific question wordings.
No online testing: All Texas CDL knowledge tests must be taken in person at an authorized Texas DPS driver license office. This is a federal requirement. There is no online version of the real test, regardless of what any third-party website claims.
No other state has a Special Requirements test. Texas created it to ensure every CDL applicant understands Texas-specific commercial driving laws before taking any other test. It covers Section 14 of the DL-7C — a section that exists only in the Texas handbook.
Most applicants underestimate this test because the name sounds like administrative paperwork. It is not. It covers specific numbers, thresholds, and rules that you must know precisely — not approximately.
| Topic | What You Need to Know Precisely |
|---|---|
| Test order rule | Special Requirements must be passed FIRST — before any other CDL test. Failing it ends all testing for that day. |
| CLP fee and validity | $25 application fee. Valid for 180 days (not 12 months). Renewable once, up to 30 days before expiration. |
| CDL Classes | Class A = GCWR 26,001+ lbs with towed vehicle over 10,000 lbs GVWR. Class B = single vehicle 26,001+ lbs. Class C = 16+ passengers or hazmat placards. |
| Age requirements | 18 minimum for intrastate Texas driving. 21 minimum for interstate, hazmat across state lines, or passengers across state lines. |
| Alcohol BAC limit | 0.04% in a CMV — half the standard limit. No driving within 4 hours of consuming any alcohol. 24-hour out-of-service at 0.04%+. |
| Disqualifying offenses | First DUI in CMV: 1-year disqualification. Second: lifetime. CMV used in a drug felony: lifetime. Two serious violations in 3 years: 60 days. |
| Hours of Service | Max 11 hours driving after 10 hours off. 14-hour on-duty window. 30-minute break after 8 hours driving. 60/70-hour weekly limits. |
| Retest rules | 24-hour wait between retests. 90-day application window. After 3 failures or 90 days: reapply and pay $25 again. |
| English-only testing | As of June 1, 2026, all Texas CDL knowledge tests are in English only. No Spanish. No interpreters. |
The General Knowledge test is required for every CDL class — A, B, and C — regardless of what vehicle you plan to drive. It covers Sections 1 through 4 of the DL-7C and is the largest test at 50 questions. You need 40 correct (80%) to pass.
| Topic Area | Questions to Master |
|---|---|
| Following Distance Formula | 1 second per 10 feet of vehicle length + 1 extra second for speeds over 40 mph. Double in adverse conditions. Know how to calculate for any vehicle length and speed. |
| Pre-Trip Inspection | The 7-step sequence. Minimum tire tread depths (4/32 inch steering axles, 2/32 inch all others). What makes a vehicle unsafe to drive. |
| Stopping Distance Components | Perception distance + reaction distance + braking distance. Add brake lag for air brake vehicles. Know what affects each component. |
| Cargo Securement | First check within 50 miles, then every 150 miles or 3 hours. Aggregate WLL must be 1.5x cargo weight. Maximum 10 feet from cargo end to first tie-down. |
| Speed Management on Downgrades | Select correct gear BEFORE the descent. Same gear as going uphill. Engine braking primary, service brakes supplemental. Snub braking technique. |
| Emergency Maneuvers | Blowout: hold wheel, do not brake immediately. Swerve: steer then countersteer immediately. Front-wheel skid: release brakes to restore steering. |
| No-Zones | Four blind spot areas — front (20+ feet), rear (30+ feet), right side (largest), left side. Vehicles in No-Zones cannot be seen regardless of mirror adjustment. |
| Bad Weather Driving | Roads most slippery at START of rain. Bridge decks freeze before road surfaces. Dust storm: pull off completely, turn off ALL lights including hazards, foot off brake. |
If you do not pass the Air Brakes test, your Texas CDL will have an air brake restriction — meaning you cannot legally drive any CMV equipped with air brakes. Since most Class A tractor-trailers have air brakes, this effectively limits where you can work. For anyone pursuing a tractor-trailer career, passing the Air Brakes test is essential.
| Topic Area | Key Numbers to Know |
|---|---|
| Normal Operating Pressure | 100–125 PSI. Governor cuts in at ~100 PSI, cuts out at ~120–125 PSI. |
| Low Air Warning | Must activate at or before 60 PSI. Both buzzer and light required. |
| Spring Brake Activation | Spring brakes apply automatically at 20–45 PSI. Yellow diamond = tractor. Red octagon = trailer. |
| LAB Pre-Trip Test | L = Leaks (max 3 PSI/min single, 4 PSI/min combination). A = Application (warning at 60, spring brakes at 20–45). B = Build-up (85 to 100 PSI in 45 seconds at idle). |
| Safety Relief Valve | Opens at approximately 150 PSI to prevent overpressure. Never activates during normal operation. |
| Brake Lag | Approximately 0.5 seconds. At 55 mph = approximately 40 feet of unbraked travel before brakes begin applying. |
| ABS Technique | Apply firm steady pressure and HOLD. Do NOT pump brakes on ABS-equipped vehicles. |
| Drain Tanks | Daily — moisture and oil accumulate from compression. Prevents frozen brake lines in cold weather. |
The Combination Vehicles test is the final knowledge test for Class A CDL applicants. It is the shortest test at 20 questions but covers some of the most dangerous real-world scenarios in commercial driving — jackknife, rollover, off-tracking, and coupling failures.
| Topic Area | What You Must Know |
|---|---|
| Coupling Procedure | Inspect FIRST before backing under. Tug test: trailer must not move when pulled against applied brakes. No gap between fifth wheel and bolster plate. Release handle locked. |
| Air Line Colors | RED = emergency/supply line. BLUE = service line. Crossing the lines causes dangerous brake malfunction. Never cross them. |
| Tractor Jackknife | Caused by DRIVE wheel lockup. Rear of tractor slides sideways. Recovery: release all brakes immediately to restore wheel rotation. |
| Trailer Jackknife | Caused by TRAILER wheel lockup. Trailer swings outward. Higher risk with empty trailers (less traction). Recovery: release brakes immediately. |
| Rollover Prevention | Speed is the #1 factor. Reduce speed BEFORE the curve — never brake inside a curve. Risk increases with the square of speed. |
| Off-Tracking | Rear trailer wheels follow a shorter arc than tractor front wheels. Swing wide LEFT before turning RIGHT. Longer trailer = more off-tracking. |
| Uncoupling Order | Lower landing gear FIRST, then apply trailer brakes, then disconnect air/electrical lines, then release fifth wheel, then pull tractor forward slowly. |
| Brake in Straight Line | Always brake in a straight line on combination vehicles. Braking during a turn dramatically increases jackknife risk — even with ABS. |
Bring all required documents — valid Texas driver license, Social Security Number, proof of citizenship or lawful presence, completed CDL-1 application, self-certification form (CDL-4, CDL-5, or CDL-10), and Medical Examiner Certificate if required. Missing any document means you cannot proceed that day.
A license and permit specialist processes your CDL-1 application, collects your $25 fee, takes your thumbprints and photo, and administers a vision screening. You must have at least 20/40 vision in each eye with or without correction and adequate field of vision.
You are directed to a computer station to take the Special Requirements test — 35 questions, 28 correct to pass. This must be completed before any other test. If you fail, testing ends for the day. You must wait 24 hours and return.
50 questions, 40 correct to pass. Take your time — no time limit. Read each question twice before answering. If you are unsure, move on and come back.
If your CDL class requires these tests, you take them in sequence after General Knowledge. Air Brakes: 25 questions, 20 to pass. Combination Vehicles: 20 questions, 16 to pass.
After passing all required tests, your Commercial Learner Permit is issued. You receive a temporary document at the DPS office — the physical card is mailed separately. The CLP is valid for 180 days. You must hold it for at least 14 days before taking the skills test.
FastLessonHub has 350 free Texas CDL practice questions — more than any other free platform — organized by module, filterable by topic and difficulty, with full rationale on every answer. Start with Special Requirements since it must be passed first.
The most common reason people fail is not lack of effort — it is studying the wrong way. Here is what actually works:
The one thing that separates passing from failing: Competitors test memory. FastLessonHub builds understanding. Every practice question on this platform includes the section of the DL-7C it comes from and a full explanation of why each answer is right or wrong. Understanding the concept means you pass even when the DPS words the question differently than you practiced.
Topic filters. Difficulty levels. Full rationale on every answer. The only free platform with a dedicated Texas Special Requirements module. No signup. No paywall.
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