At an uncontrolled T-intersection, vehicles on the through road have right of way over:

Vehicles on the terminating road

Vehicles already in the intersection

Emergency vehicles using sirens

Pedestrians in a marked crosswalk

Which of these is a warning sign that you are too drowsy to drive safely?

You cannot remember driving the last few miles

You feel hungry and want to stop for a snack

You notice more traffic signs than usual

Your passengers start talking more loudly

Hydroplaning is most likely to occur when:

Driving fast on a wet road, mainly with worn tires

Driving on dry pavement on a very hot day

Braking gently on an icy road in the cold

Driving slowly through deep, soft snow on a hill

Free Illinois SOS Practice Permit Test - Practice Test 4 2026

25 questions80% to passExplanations includedFree

35Real test questions

80%Pass score

This Practice Test 4 is modeled on the Secretary of State (SOS) written knowledge exam, which has 35 questions; to pass you need 28 of 35 correct (80%). These 25 questions rotate through traffic laws, road signs, and right-of-way - the core topics the SOS tests most heavily. Every question includes an explanation, so you learn the rule behind each answer - not just whether you got it right.

Question 1 of 25

A 'LANE ENDS' warning sign (showing one lane merging into another) means:

Tip: Press 1-4 to select, Enter to submit, F to flag

Inside this test

What's on the Illinois Practice Test 4

The real Illinois knowledge test has 35 questions, and to pass you need 28 of 35 correct (80%). Practice Test 4 is a 25-question set drawn from 42 questions, scored against a practice target of 80%.

Topics in this test's question pool

Road signs 15
Safe driving 10
Traffic laws 6
Right of way 4
Alcohol & drugs 2
Vehicle equipment 2
Emergencies 2
Parking 1

42 questions in the pool, 1 of them written specifically for Illinois. Each attempt shows 25 in a new order.

Sample questions from this test, with answers

Want to test yourself first? Take the test above before reading these. Every answer below is checked against the source shown.

1. Under Illinois' Zero Tolerance law, a first offense for a driver under 21 with any alcohol results in:
- A. A 3-month license suspension (correct)
- B. A written warning on a first offense
- C. A 1-year license suspension
- D. A small fine with no suspension
Why: Under Illinois Zero Tolerance, a driver under 21 found with any trace of alcohol (a BAC above 0.00) has driving privileges suspended for a minimum of three months. A DUI conviction under 21 means revocation for at least two years.
Source: official Illinois driver handbook, Rules of the Road 2026 - Drivers Under Age 21 (p. 52)
2. You see this white sign on the right side of the road. What must you do?
- A. Pass only on the right
- B. Pass only trucks
- C. Do not pass other vehicles (correct)
- D. Do not stop on the road
Why: The white rectangular Do Not Pass sign is a regulatory sign posted on the right side of the road. You may not pass other vehicles where it applies.
Source: PDF p.43, Passing
3. Worn or bald tires are dangerous primarily because they:
- A. Wear out the brakes faster than normal
- B. Reduce traction and raise the risk of skidding (correct)
- C. Only matter on snow and ice, not on wet pavement
- D. Cause the car to pull hard to one side
Why: Bald or worn tires have little tread to grip the road or channel away water. This dramatically increases stopping distance and the risk of hydroplaning and skidding, especially in wet conditions.
Source: official Illinois driver handbook
4. What does a yellow pennant-shaped sign (a sideways triangle pointing right) on the left side of the road mean?
- A. Merge ahead
- B. No-passing zone begins (correct)
- C. A sharp curve
- D. Passing lane begins ahead
Why: A yellow pennant-shaped sign on the left side of the road marks the beginning of a no-passing zone. It supplements the solid yellow line on the pavement.
Source: Federal MUTCD 11th ed. (Dec 2023) 2C.53
5. A yellow diamond sign showing a 'T' shape indicates:
- A. A side road enters from one side
- B. Your road ends at a T ahead (correct)
- C. A four-way crossroad ahead
- D. A truck route begins here
Why: A 'T' symbol warns that the road you are on ends ahead at a T-intersection. Be prepared to stop or yield and turn left or right.
Source: Federal MUTCD 11th ed. (Dec 2023) 2C.41
6. Your regular brakes have failed and pumping did not help. How should you use the parking (emergency) brake?
- A. Apply it slowly and gradually (correct)
- B. Pull it on as hard as you can
- C. Only after the car has stopped
- D. Apply it and release it rapidly
Why: Setting the parking brake too hard or too fast can lock the wheels and throw the car into a skid. Apply it slowly while you steer to a safe place.
Source: official Illinois driver handbook

More Illinois facts, the full requirements table and the printable PDF are on the Illinois permit practice test page.

Illinois SOS Test Info

Questions on real test: 35
Passing score: 80%
Correct needed: 28 of 35 correct (80%)
Minimum age: 15 years old
Testing agency: Secretary of State

Official IL SOS Website ↗

More Illinois Tests

Study Tip

Don't just aim to pass this Illinois Practice Test 4 once - keep taking it until you score 80% or higher two or three times in a row. Read the explanation after every question, even the ones you get right, to lock in the rule before your SOS exam.