US driving theory test practice

Illinois DMV Cheat Sheet

A condensed study guide for the Illinois SOS written knowledge test — test logistics, plus the Illinois-specific rules most likely to differ from what you already know. This isn't a substitute for the official Illinois driver's manual, or for practicing the real questions. Looking for the core rules and signs that apply everywhere, not just Illinois? Check the general driving theory cheat sheet instead.

35Questions
80%To Pass
$30Fee
3Attempts

Illinois-Specific Rules

Minor & Provisional Licensing

  • Instruction permit (age 15-17) must be held at least 9 consecutive months before applying for a license.
  • 50 hours of supervised practice required before licensing under 18, including 10 hours at night.
  • Permit Phase curfew: Sun.-Thu. 10 p.m.-6 a.m.; Fri.-Sat. 11 p.m.-6 a.m.
  • Permit Phase passenger limit: one in the front seat, plus only as many in back as there are safety belts.
  • Initial Licensing Phase (16-17): only one passenger under 20 for the first 12 months, unless a sibling or child.
  • A conviction during the Initial Licensing Phase can extend GDL restrictions past age 18.
  • Wireless/cellphone use -- even hands-free -- is banned for any driver under 19, except to contact emergency services.
  • First-time applicants ages 18-20 with no prior driver's ed must complete a 6-hour Adult Driver Education Course.
  • A parent/guardian who consented to a 16-17 year old's license can cancel it at any time, for any reason, until 18.
  • Under 21 with 2+ moving violations in 24 months: minimum 30-day license suspension.
  • Taking a driving exam for someone else is a criminal offense with a mandatory minimum 7 days in jail.
  • The written exam must be retaken every 8 years -- unless you have no traffic convictions.

DUI Laws & Penalties

  • DUI is legally classified as a violent crime in Illinois; a conviction stays on your record permanently.
  • First-offense Statutory Summary Suspension: 1 year for refusing testing, 6 months for failing it (.08%+ BAC).
  • Second offender within 5 years: 3-year suspension for refusal, 1 year for failing the test.
  • A 45-day temporary permit is issued after a DUI arrest before the suspension actually begins.
  • DUI revocation ladder: 1st offense = 1 year min., 2nd (within 20 yrs) = 5 years min., 3rd = 10 years min., 4th+ = lifetime.
  • A first DUI conviction under age 21 carries a minimum 2-year revocation -- double the adult minimum.
  • Any trace of alcohol for a driver under 21 while driving: minimum 3-month suspension.
  • Declining the ignition-interlock (BAIID/MDDP) program and driving during a DUI suspension anyway is a felony.
  • Illegal THC threshold: 5 ng/mL of whole blood, or 10 ng/mL of another bodily substance.
  • Refusing chemical testing after a crash causing death or serious injury: minimum 1-year revocation.

Speed, Right-of-Way & Legal Rules

  • Default speed limits (unless posted): 70 mph interstates/tollways, 65 mph four-lane highways, 55 mph other highways/rural.
  • Default speed limits: 30 mph city/town areas, 15 mph alleys.
  • School zone speed: 20 mph, but only 6:30 a.m.-4 p.m. on school days, with children present and signs posted.
  • At a 4-way stop with simultaneous arrival, the vehicle on the left yields to the vehicle on the right.
  • When passing, you must return to your lane before getting within 200 feet of an oncoming vehicle.
  • Every construction zone in Illinois is a no-passing zone, regardless of markings or whether workers are present.
  • Signal continuously at least 100 feet before turning in business/residential areas, 200 feet elsewhere.
  • A U-turn on a curve or hill requires at least 500 feet of visibility in all directions.
  • A qualifying crash must be reported within 30 minutes of it occurring.

Emergency Vehicles, School Buses & Work Zones

  • A school bus warns at least 100 feet before stopping (200 feet in rural areas).
  • Illegally passing a stopped school bus: mandatory $300 fine plus community service, on top of a license suspension.
  • If the vehicle's owner wasn't driving, they must identify the actual driver or face a 3-month registration suspension.
  • Photography and cellphone use are banned within 500 feet of an active emergency scene.
  • Construction-zone speed limits apply 24/7, whether or not workers are actually present.

Parking Rules & Technique

  • Parallel parking: right-hand wheels within 12 inches of the curb.
  • No stopping/standing within 30 feet of a STOP sign, YIELD sign, or traffic signal.
  • No stopping/standing within 20 feet of a fire station driveway.
  • No parking within 50 feet of the nearest rail of a railroad crossing.

Defensive Driving

  • Safety belts are required for all drivers and passengers age 8+, in both front and back seats.
  • Children must ride rear-facing until age 2, unless over 40 lbs or 40 inches tall (effective Jan. 1, 2019).
  • Headsets are banned while driving, except a single-sided headset/earpiece.
  • Holding a phone to use speakerphone still counts as a handheld violation -- it's not hands-free.
Want the core rules and road signs that apply everywhere, not just Illinois?General cheat sheet →

Rules and fees change — always confirm current details with Illinois SOS before your exam. Cheat sheet v1.0, last checked 2026-07-27.