CDL Practice Test California 2026: 25 Q&A + Pass Tips

The California CDL general knowledge test has 50 multiple-choice questions and requires at least 40 correct answers (80%) to pass. You must be 18+ for in-state driving or 21+ for interstate (FMCSA, 2026), hold a current DOT medical certificate, hold a CLP for ≥14 days, and complete the skills test within 180 days. The application fee is $86 plus $10 per endorsement (California DMV, 2026).

Data last verified September 2026 from California DMV, the FMCSA CDL Manual, and the current California Commercial Driver Handbook.

Who needs a California CDL

A California Class A CDL is required to operate any combination of vehicles over 26,001 lb GVWR where the trailer exceeds 10,001 lb. Class B covers single vehicles over 26,001 lb; Class C covers vehicles carrying 16+ passengers or placarded hazardous materials that don't meet Class A/B thresholds (FMCSA, 2026). California has approximately 575,000 active CDL holders as of 2025, with port drayage and long-haul being the largest employer categories (California Department of Transportation, 2025).

Eligibility

• Age: 18+ (in-state) / 21+ (interstate) (FMCSA, 2026).
• California residency: Two proofs — utility bill, bank statement, rental agreement, or tax record.
• Medical: Current MCSA-5876 medical certificate.
• CLP: Held for ≥14 days before the skills test.
• Driving record: No active suspensions or major violations.

CDL written test format

Source: California DMV Commercial Driver Handbook (2026).

Sample Q&A — General Knowledge (20 questions)

Q1. What is the minimum following distance for a CMV at highway speed in good conditions?

7 seconds minimum (1 second per 10 ft of vehicle length). FMCSA §392.22 (2026).

Q2. When must you stop before crossing railroad tracks?

Always, for HazMat-placarded CMVs — within 15–50 ft of the nearest rail. FMCSA §392.10 (2026).

Q3. How often must you perform a pre-trip inspection?

Before every trip; written inspection report required. FMCSA §396.11 (2026).

Q4. What is the legal BAC for a CMV driver?

0.04% — half the standard limit. FMCSA §382.201 (2026).

Q5. Maximum driving hours per shift?

11 hours driving within a 14-hour on-duty window after 10 consecutive off-duty hours. FMCSA §395.3 (2026).

Q6. What does a diamond placard on a tanker indicate?

A hazardous material load identified by UN number. 49 CFR §172.504 (2026).

Q7. When are hazard lights required while parked on a roadway?

When stopped on the travelled portion or shoulder unless using flares or reflectors. FMCSA §392.22 (2026).

Q8. Minimum tread depth on steer tires?

4/32 inch (3 mm). FMCSA §393.75 (2026).

Q9. Air system leak rate (single vehicle)?

≤3 psi/min after governor cut-out. California Commercial Driver Handbook, Ch. 5 (2026).

Q10. Emergency braking distance at 60 mph (loaded tractor-trailer)?

Approximately 300 ft — perception (1.25 s) + brake lag (0.5 s) + braking distance. FMCSA study (2026).

Q11. Reflective triangle placement?

10 ft, 100 ft, 200 ft behind the vehicle, within 10 min. FMCSA §392.22 (2026).

Q12. Bridge formula purpose?

Limits gross weight on consecutive axles based on axle spacing — protects bridges. 23 CFR §658.17 (2026).

Q13. ELD exemption?

150 air-mile radius drivers returning to base each day, pre-2000 vehicles, short-haul paper-log drivers. FMCSA §395.1 (2026).

Q14. Maximum CMV width on interstate?

102 inches (8.5 ft). 23 CFR §658.15 (2026).

Q15. On-duty window after 10 hours off?

14 cumulative hours on duty, including up to 11 hours driving. FMCSA §395.3 (2026).

Q16. Intrastate vs interstate definition?

Intrastate: trade entirely within California. Interstate: crosses state lines. FMCSA §390.5 (2026).

Q17. CDL downgrade after disqualification?

File CDLIS Voluntary Withdrawal form with DMV; surrender CDL, receive Class C. California DMV (2026).

Q18. Fire extinguisher requirement?

5-B:C UL-listed extinguisher on passenger/HazMat CMVs. FMCSA §393.95 (2026).

Q19. GCWR definition?

Gross combination weight rating — total of powered unit + trailer + load. Class A > 26,001 lb. FMCSA §383.5 (2026).

Q20. Personal-vehicle DUI effect on CDL?

1-year disqualification (first), life (second). FMCSA §383.51 (2026).

Pass-mark and score interpretation

The California DMV scores each knowledge test independently — you must clear 80% on every test taken (no averaged pass). Retake rule: 1-day waiting period between attempts (California DMV, 2026).

Where to book the California CDL test

Schedule via DMV online portal (dmv.ca.gov/portal/appointments) or walk in. Bring CLP, DOT medical card, Social Security card, two residency proofs, and CDL training certificate (if applicable). HazMat requires TSA enrollment first (California DMV, 2026).

Resources and next steps

After passing, add HazMat/Tanker/Passenger endorsements as your job requires. Use the TutorsBot entrance-exams hub for cross-cluster practice and the FMCSA CDL Manual for any rule citation. For cybersecurity awareness on the road, see our sibling guide on spotting phishing emails targeting dispatchers and fleet managers.

California CDL career outlook 2026

California has the highest CDL wages in the US due to port drayage (LA/Long Beach — the largest US container port complex), agricultural haulage (Central Valley produce), and tech-corridor last-mile freight. The Bureau of Labor Statistics (BLS, 2026) reports heavy-truck driver median wage of $58,900 in California, with top-10% earners exceeding $84,000. Port drayage at LA/Long Beach typically pays $0.75-$0.95 per mile — among the highest rates in the US. California-specific endorsements (H, N, T, P, S) add $1-$5 per hour. California has the strictest emissions and HOS enforcement in the US — CARB compliance training is recommended. Apprenticeship programs at California carriers (Knight-Swift, Werner, Schneider, UPS Freight) offer paid CDL training with 12-24 month commitments. CA DMV offices offering CDL skills tests are concentrated in Los Angeles, Oakland, Stockton, Fresno, Bakersfield, and Sacramento.