Build the foundation every Texas CDL applicant needs.
General Knowledge supports every CDL class. This Texas set blends standard commercial-driving safety with Texas-specific CLP timing, testing sequence, pass score, application limits, and age rules.
01Vehicle inspection
02Speed and space
03Backing and turns
04Weather and emergencies
05Cargo safety
06Texas CLP and exam rules
PRACTICE MODE
Texas CDL General Knowledge Test
Question order and answer order shuffle on each attempt. Choose one answer, read the explanation, then use Back or Next to continue.
Question 1 of 25Score 0
What minimum tread depth is generally required in every major groove of a front steering tire?
Answer: 4/32 inch
Steering-axle tires generally need at least 4/32 inch of tread in every major groove. Other tires generally require at least 2/32 inch. Study: Texas CDL Handbook — Section 2: Driving Safely — vehicle inspection
Below 40 mph, what following-distance guideline applies to a commercial vehicle?
Answer: At least 1 second for each 10 feet of vehicle length
The standard guideline is at least one second for each 10 feet of vehicle length at speeds below 40 mph. Add another second when traveling faster than 40 mph. Study: Texas CDL Handbook — Section 2: Driving Safely — space management
When should most speed reduction for a curve occur?
Answer: Before entering the curve
Slow to a safe speed before entering a curve, then use smooth control inputs. Hard braking in a curve can increase skid or rollover risk. Study: Texas CDL Handbook — Section 2: Driving Safely — curves
What is the first safe response to a tire blowout while moving?
Answer: Hold the steering wheel firmly and stay off the brake initially
A firm grip helps maintain direction while the vehicle slows. Braking hard immediately can worsen loss of control; slow gradually and move off when stable. Study: Texas CDL Handbook — Section 2: Driving Safely — tire failure
When should a driver dim high beams for an approaching vehicle?
Answer: Before the lights create glare for the other driver
High-beam glare can temporarily reduce another driver’s vision. Dim them early enough to protect both drivers’ ability to see. Study: Texas CDL Handbook — Section 2: Driving Safely — night driving
Before crossing railroad tracks, what must a driver be sure of?
Answer: There is enough space to clear the tracks completely
Never enter a crossing unless the entire vehicle can clear all tracks. A long combination needs more clearance than a passenger car. Study: Texas CDL Handbook — Section 2: Driving Safely — railroad crossings
What is the only reliable cure for fatigue?
Answer: Sleep
Short-term tricks do not replace restorative sleep. If drowsy, stop in a safe place and sleep before continuing. Study: Texas CDL Handbook — Section 2: Driving Safely — driver fitness
Why is a front-wheel skid especially dangerous?
Answer: The vehicle tends to continue straight despite steering input
When front tires lose traction, steering may have little effect. Slow before turns and avoid excessive speed or hard braking that can trigger the skid. Study: Texas CDL Handbook — Section 2: Driving Safely — skids
How should cargo weight generally be distributed?
Answer: As low and balanced as practical
Balanced, low placement improves stability and prevents overloading an axle or tire. Poor distribution can impair steering, braking, and rollover resistance. Study: Texas CDL Handbook — Section 2: Driving Safely — cargo distribution
Why should engine retarders be used cautiously on slippery roads?
Answer: They can cause drive wheels to lose traction
A retarder slows the drive wheels and can contribute to a skid on poor traction. Follow the manufacturer’s guidance and turn it off when conditions require. Study: Texas CDL Handbook — Section 2: Driving Safely — retarders
How should a professional driver respond to an aggressive driver?
Answer: Avoid confrontation and create space
Do not escalate aggressive behavior. Increase space, let the vehicle go, and contact authorities if there is an immediate danger. Study: Texas CDL Handbook — Section 2: Driving Safely — aggressive drivers
Why is smooth steering especially important in a large vehicle?
Answer: Abrupt steering can cause a skid, cargo shift, or rollover
Large and top-heavy vehicles respond poorly to sudden direction changes. Look ahead and steer gradually so the vehicle remains stable. Study: Texas CDL Handbook — Section 2: Driving Safely — steering
Before starting the engine, what should a driver confirm about the parking brake?
Answer: It is set
Setting the parking brake helps prevent unintended movement while the engine is started and initial checks are completed. Study: Texas CDL Handbook — Section 2: Driving Safely — starting procedure
Why must brake drums or discs be free of oil and grease?
Answer: Contamination can reduce braking friction
Braking depends on friction. Oil or grease on friction surfaces can greatly reduce stopping ability. Study: Texas CDL Handbook — Section 2: Driving Safely — brake inspection
Where should a backing helper stand?
Answer: Where the driver can see the helper clearly
The driver and helper must maintain clear communication. Stop immediately if the helper disappears from view. Study: Texas CDL Handbook — Section 2: Driving Safely — backing helper
Why must tail swing be considered before a turn?
Answer: The rear can swing into nearby hazards
As the front turns one way, the rear overhang can move the opposite way and strike objects or people. Study: Texas CDL Handbook — Section 2: Driving Safely — tail swing
When is the horn most appropriate?
Answer: When needed to alert others to danger
The horn is a warning device. Use it briefly when doing so may prevent a collision. Study: Texas CDL Handbook — Section 2: Driving Safely — horn use
Why should windshield glass and mirrors be kept clean?
Answer: Dirt and glare can hide hazards
Clear glass and mirrors improve early hazard recognition, especially at night, in rain, or in low-angle sunlight. Study: Texas CDL Handbook — Section 2: Driving Safely — visibility
What should be done before beginning a steep downgrade?
Answer: Select a safe gear and speed
Early gear selection lets engine braking assist and reduces heat buildup in the service brakes. Study: Texas CDL Handbook — Section 2: Driving Safely — mountain driving
Why must cargo not block emergency equipment?
Answer: The driver may need immediate access
Fire extinguishers, warning devices, and other emergency equipment must remain accessible. Study: Texas CDL Handbook — Section 2: Driving Safely — cargo placement
How long must a Texas CLP normally be held before the CDL skills test?
Answer: At least 14 days
Texas requires the CLP to be held for at least 14 days before skills testing for first-time CDL applicants and specified upgrades or endorsements. Study: Texas DPS — How to Apply for a CDL
What minimum score must a Texas applicant earn on each required CDL knowledge-exam section?
Answer: 80 percent
The current Texas CDL handbook requires a score of 80 percent or higher on each required knowledge-exam section. Study: Texas CDL Handbook — Commercial Driver License Examinations
As of June 1, 2026, how are Texas CDL knowledge examinations administered?
Answer: In English only
Texas DPS changed CDL and CLP knowledge testing to English-only administration effective June 1, 2026. Skills testing also remains in English. Study: Texas DPS — How to Apply for a CDL
What is the minimum age for ordinary intrastate CMV operation in Texas?
Answer: 18 years old
Texas permits qualified intrastate commercial operation beginning at age 18. Non-excepted interstate drivers must be at least 21. Study: Texas DPS — CDL Medical Certification Requirement
After an unsuccessful knowledge test on the initial Texas CDL application date, when can the application become void?
Answer: If all required tests are not passed within 90 days or after three failed attempts, whichever comes first
The Texas handbook keeps the application active for 90 days after an unsuccessful knowledge test on the initial application date, but three failed attempts can void it sooner. Study: Texas CDL Handbook — Commercial Driver License Examinations
Use practice to find the handbook sections you still need.
01
Answer without guessing from memory
Use the first attempt to expose weak knowledge instead of memorizing answer positions.
02
Read every explanation
When a rule is Texas-specific, confirm it in the current Texas DPS material linked below.
03
Retake after review
Aim for consistent mastery across both the Texas mixed test and every focused test your CDL goal requires.
COMMON QUESTIONS
General Knowledge practice test FAQ
Is this Texas General Knowledge practice test free?
Yes. The 25-question practice test, instant feedback, scoring, and answer explanations are available without registration.
Are these official Texas DPS exam questions?
No. They are original study questions written from Texas DPS and standard CDL handbook topics. The Texas DPS controls the real knowledge and skills examinations.
Should I still read the Texas Commercial Driver Handbook?
Yes. Use the current Texas Commercial Motor Vehicle Drivers Handbook and Texas DPS instructions as the final authority, especially for licensing steps, restrictions, medical rules, and state-specific procedures.
What score should I aim for while practicing?
Texas requires 80 percent or higher on each required CDL knowledge-exam section. For practice, aim to score comfortably above that and review every missed explanation.
FACT-CHECKED STUDY BASIS
Texas DPS and federal sources
These are original study questions, not copied licensing-exam questions. Texas DPS guidance and the current Texas Commercial Motor Vehicle Drivers Handbook control state procedures; federal standards apply where incorporated.
Important: CDL Test Practice is an independent study website and is not affiliated with Texas DPS or FMCSA. Rules and procedures can change; verify current official instructions before applying or testing.