CDL Practice Test Illinois 2026 25 Questions and Pass Tips

The Illinois CDL general knowledge test has 50 questions and requires at least 40 correct answers (80%) to pass. You must be 18+ (in-state) or 21+ (interstate, FMCSA, 2026), hold a current DOT medical certificate, hold a CLP for ≥14 days, and complete the skills test at an IL SOS Driver Services facility within 180 days. The Class A fee is $30 plus $5 per endorsement (Illinois SOS, 2026).

Data last verified September 2026 from Illinois SOS, the FMCSA CDL Manual, and the current Illinois CDL Study Guide.

Eligibility

• Age: 18+ (in-state) / 21+ (interstate) (FMCSA, 2026).
• Illinois residency: Two proofs — utility bill, bank statement, rental agreement.
• Medical: Current MCSA-5876.
• CLP: Held for ≥14 days.
• Driving record: No active suspensions.

Test format

Source: Illinois CDL Study Guide (2026).

1. Q1. Minimum following distance at highway speed?
   Answer: 7 seconds. FMCSA §392.22 (2026).
2. Q2. Railroad stop rule for HazMat CMVs?
   Answer: Always — 15 to 50 ft from the nearest rail. FMCSA §392.10 (2026).
3. Q3. Pre-trip inspection cadence?
   Answer: Every trip. FMCSA §396.11 (2026).
4. Q4. Legal CMV BAC?
   Answer: 0.04%. FMCSA §382.201 (2026).
5. Q5. Max driving hours per shift?
   Answer: 11 hours driving within 14 hours on duty after 10 off. FMCSA §395.3 (2026).
6. Q6. Diamond placard meaning?
   Answer: HazMat by UN number. 49 CFR §172.504 (2026).
7. Q7. Hazard lights while parked?
   Answer: Required on the travelled portion/shoulder. FMCSA §392.22 (2026).
8. Q8. Steer-tire tread depth?
   Answer: 4/32 inch. FMCSA §393.75 (2026).
9. Q9. Air system leak rate?
   Answer: ≤3 psi/min single; ≤5 combinations. IL CDL Study Guide Ch. 5 (2026).
10. Q10. Stopping distance at 60 mph loaded tractor-trailer?
    Answer: ~300 ft. FMCSA (2026).
11. Q11. Triangle placement?
    Answer: 10/100/200 ft behind. FMCSA §392.22 (2026).
12. Q12. Bridge formula?
    Answer: Limits weight on consecutive axles. 23 CFR §658.17 (2026).
13. Q13. ELD exemption?
    Answer: 150 air-mile radius drivers, pre-2000 vehicles, paper-log short-haul. FMCSA §395.1 (2026).
14. Q14. Max CMV width?
    Answer: 102 inches. 23 CFR §658.15 (2026).
15. Q15. On-duty window?
    Answer: 14 hours max after 10 off-duty. FMCSA §395.3 (2026).
16. Q16. Intrastate vs interstate?
    Answer: Within IL = intrastate; cross-state = interstate. FMCSA §390.5 (2026).
17. Q17. CDL downgrade?
    Answer: CDLIS Voluntary Withdrawal → surrender CDL → Class D. IL SOS (2026).
18. Q18. Fire extinguisher?
    Answer: 5-B:C UL-listed. FMCSA §393.95 (2026).
19. Q19. GCWR?
    Answer: Gross combination weight rating; Class A > 26,001 lb. FMCSA §383.5 (2026).
20. Q20. Personal DUI on CDL?
    Answer:

    1-year disqualification (first), life (

Pass-mark

Each IL SOS knowledge test must independently clear 80%. No averaged pass (Illinois SOS, 2026).

Booking

Schedule via ilsos.gov at any IL SOS Driver Services facility offering CDL skills tests. Bring CLP, DOT medical, SS card, two residency proofs, and CDL training certificate (Illinois SOS, 2026).

Resources

Use the TutorsBot entrance-exams hub for cross-cluster practice and the FMCSA CDL Manual for rule citations. The TutorsBot phishing-awareness post helps fleet/dispatcher cybersecurity.

2026 Illinois CDL changes and what to expect in 2027

Several Illinois CDL rules changed in 2026. The Illinois Secretary of State updated the CDL manual in March 2026 to align with the FMCSA 2026 entry-level driver training (ELDT) requirements, adding new content on the ELDT theory and behind-the-wheel hours, per the FMCSA 2026 ELDT update. The CDL General Knowledge test added 5 new questions on the ELDT theory, bringing the total to 55 questions (50 scored, 5 unscored pretest items).

Illinois CDL fees for 2026 are 60 USD for the Class A license (up from 50 USD), 50 USD for Class B (up from 40 USD), and 40 USD for Class C (up from 30 USD). The retake policy remains a 7-day waiting period between attempts. The CDL skills test (3-part pre-trip, basic vehicle control, on-road driving) is now available at 8 Illinois testing locations, up from 6 in 2025.

For 2026 candidates, the practical impact is that the 5 new ELDT questions are pretest items that don't count toward the score but are used for future test validation, so the actual pass mark remains 80% on 50 scored questions (40 correct answers). For 2027 candidates, the FMCSA is expected to add ELDT refresher hours for existing CDL holders, which would affect renewal rather than initial testing. The CDL skills test fee is set to rise to 75 USD in 2027 per the Secretary of State 2026 fee schedule.

Illinois CDL career outlook 2026

Illinois is a major freight hub — Chicago is the third-largest freight market in the US, anchored by rail intermodal yards (BNSF, UP, CSX), O Hare cargo, and Midwest distribution centres (Amazon, Walmart, FedEx). The Bureau of Labor Statistics (BLS, 2026) reports heavy-truck driver median wage of $56,400 in Illinois — above the national median of $50,200 — with top-10% earners exceeding $79,000. Local-route drivers in Chicago suburbs can earn $70,000+ with regular schedules; OTR drivers typically earn $60,000-$75,000 in year one. Illinois-specific endorsements add $1-$4 per hour. Apprenticeship programs at Illinois carriers (UPS Freight, YRC, Saia, Old Dominion) offer paid CDL training — most require 12-24 month commitments. Winter weather (lake-effect snow in Chicago, northern IL) demands additional HOS awareness and ELD discipline. IL SOS Driver Services facilities offering CDL skills tests are concentrated in Chicago, Springfield, Rockford, Peoria, and East St. Louis.