CDL — Bằng Lái Thương Mại in Illinois

Testing agency

Illinois Secretary of State

Written-test languages

English · Spanish

To pass

80% (≥35 questions per test) — federal min

Fee

No separate written-test fee; CLP add $50, CDL A/B/C $60

Retake policy

Retest next business day; fail same test 3× → wait 30 days (to confirm exact wording)

Languages note

Spanish added July 2024; no interpreter allowed for the CDL knowledge test. The 130+ language interpreter program is non-commercial only.

Languages, fees and rules change — confirm with the official source linked for each state. 'To confirm' = not yet confirmed from an official source (shown honestly, never guessed). The 2025 federal English-Language-Proficiency action is roadside out-of-service enforcement, not a state test-language mandate; states set their own written-test languages (Texas and Florida moved to English-only in 2026).