Texas CDL Exam Practice||questions and
answers with rationales/graded A+/2026
update/100% correct /instant download
1. What is the minimum age to obtain a Texas CDL for intrastate (Texas only)
commercial driving?
A) 18 years old
B) 19 years old
C) 21 years old
D) 25 years old
Correct Answer: A
Rationale: You can obtain a Texas CDL for intrastate driving at age 18. However,
to drive across state lines (interstate commerce), federal law requires you to be at
least 21 years old .
2. What is the minimum following distance for a commercial vehicle in ideal
conditions?
A) 2 seconds
B) 4 seconds
C) 6 seconds
D) 10 seconds
,Correct Answer: B
Rationale: Commercial vehicles require more stopping distance than passenger
cars. The recommended minimum following distance is 4 seconds in ideal
conditions. Add 1 second for poor road conditions, night driving, or heavy traffic.
3. The Texas Department of Public Safety (DPS) administers CDL knowledge tests
in which language(s)?
A) English and Spanish
B) English only
C) Any language with an interpreter
D) English, Spanish, and Vietnamese
Correct Answer: B
Rationale: Effective June 1, 2026, all Texas CDL and CLP knowledge
examinations are administered in English only. Interpreters are prohibited .
4. A commercial driver's blood alcohol concentration (BAC) limit is:
A) 0.04%
B) 0.08%
C) 0.10%
D) 0.02%
Correct Answer: A
,Rationale: The legal BAC limit for commercial drivers operating a CMV is 0.04%
— half the limit for non-commercial drivers (0.08%). Operating a CMV with a
BAC of 0.04% or higher results in disqualification.
5. What is the single most common reason Texas applicants fail the DOT medical
exam?
A) Vision problems
B) High blood pressure
C) Hearing loss
D) Diabetes
Correct Answer: B
Rationale: High blood pressure is the most common reason Texas CDL applicants
fail the DOT medical exam . Maintaining healthy blood pressure is critical for
passing your medical certification.
6. When must you use your turn signals?
A) Only when changing lanes
B) Only when turning at intersections
C) At least 100 feet before any turn or lane change
D) Only at night
Correct Answer: C
, Rationale: You must signal at least 100 feet before any turn or lane change. This
gives other drivers adequate warning of your intentions, which is especially
important for large commercial vehicles.
7. What should you do if your vehicle's brakes get wet after driving through
standing water?
A) Increase speed to dry them
B) Gently apply brakes while driving slowly to dry them
C) Use parking brake only
D) Stop and wait for them to air dry
Correct Answer: B
Rationale: After driving through water, gently apply your brakes while driving
slowly. The friction will create heat that dries the brake components and restores
normal braking function.
8. What is the penalty for a first-time CDL holder caught texting while driving a
CMV?
A) Warning only
B) $500 fine
C) Disqualification of CDL
D) Points on license only
Correct Answer: C
answers with rationales/graded A+/2026
update/100% correct /instant download
1. What is the minimum age to obtain a Texas CDL for intrastate (Texas only)
commercial driving?
A) 18 years old
B) 19 years old
C) 21 years old
D) 25 years old
Correct Answer: A
Rationale: You can obtain a Texas CDL for intrastate driving at age 18. However,
to drive across state lines (interstate commerce), federal law requires you to be at
least 21 years old .
2. What is the minimum following distance for a commercial vehicle in ideal
conditions?
A) 2 seconds
B) 4 seconds
C) 6 seconds
D) 10 seconds
,Correct Answer: B
Rationale: Commercial vehicles require more stopping distance than passenger
cars. The recommended minimum following distance is 4 seconds in ideal
conditions. Add 1 second for poor road conditions, night driving, or heavy traffic.
3. The Texas Department of Public Safety (DPS) administers CDL knowledge tests
in which language(s)?
A) English and Spanish
B) English only
C) Any language with an interpreter
D) English, Spanish, and Vietnamese
Correct Answer: B
Rationale: Effective June 1, 2026, all Texas CDL and CLP knowledge
examinations are administered in English only. Interpreters are prohibited .
4. A commercial driver's blood alcohol concentration (BAC) limit is:
A) 0.04%
B) 0.08%
C) 0.10%
D) 0.02%
Correct Answer: A
,Rationale: The legal BAC limit for commercial drivers operating a CMV is 0.04%
— half the limit for non-commercial drivers (0.08%). Operating a CMV with a
BAC of 0.04% or higher results in disqualification.
5. What is the single most common reason Texas applicants fail the DOT medical
exam?
A) Vision problems
B) High blood pressure
C) Hearing loss
D) Diabetes
Correct Answer: B
Rationale: High blood pressure is the most common reason Texas CDL applicants
fail the DOT medical exam . Maintaining healthy blood pressure is critical for
passing your medical certification.
6. When must you use your turn signals?
A) Only when changing lanes
B) Only when turning at intersections
C) At least 100 feet before any turn or lane change
D) Only at night
Correct Answer: C
, Rationale: You must signal at least 100 feet before any turn or lane change. This
gives other drivers adequate warning of your intentions, which is especially
important for large commercial vehicles.
7. What should you do if your vehicle's brakes get wet after driving through
standing water?
A) Increase speed to dry them
B) Gently apply brakes while driving slowly to dry them
C) Use parking brake only
D) Stop and wait for them to air dry
Correct Answer: B
Rationale: After driving through water, gently apply your brakes while driving
slowly. The friction will create heat that dries the brake components and restores
normal braking function.
8. What is the penalty for a first-time CDL holder caught texting while driving a
CMV?
A) Warning only
B) $500 fine
C) Disqualification of CDL
D) Points on license only
Correct Answer: C
