Illinois Lanes & Turns practice test
Practice lane markings, turns, passing and merging: 39 questions based on the Illinois Rules of the Road, 18 of them on Illinois's own rules.
Key Illinois facts: Lanes & Turns
Sample Lanes & Turns questions
You just missed your exit on an Illinois expressway. What should you do?
Make a U-turn at the next median opening Continue to the next exit Stop and wait for a gap to reverse Back up along the shoulder Show the answer
Continue to the next exit
The law forbids backing up on an expressway. Go to the next available exit.
Source: Illinois Rules of the Road (2026), Chapter 4, Traffic Laws: Lane Usage (p. 30); Chapter 11, Safe Driving Tips: Expressway Driving (p. 86)
How do you let other drivers know you are leaving an Illinois roundabout?
Use your left turn signal Use your right turn signal Tap your horn once Flash your headlights Show the answer
Use your right turn signal
Use the right signal when you exit. Check for vehicles continuing through the roundabout before you change lanes or exit.
Source: Illinois Rules of the Road (2026), Chapter 4, Traffic Laws: Rotary and Roundabout (p. 32)
In Illinois, how far must you be able to see in all directions to make a U-turn on a curve or hill?
At least 100 feet At least 1,000 feet At least 500 feet At least 200 feet Show the answer
At least 500 feet
On a curve or hill, a U-turn is banned unless you can see 500 feet in all directions. Towns may also ban U-turns on some roads.
Source: Illinois Rules of the Road (2026), Chapter 4, Traffic Laws: U-Turns (p. 32)
In Illinois, every construction zone is a no-passing zone on a two-lane, two-way road.
Show the answer
True
The handbook treats all construction zones in the state as no-passing zones.
Source: Illinois Rules of the Road (2026), Chapter 4, Traffic Laws: Passing (p. 29)
An Illinois street has a two-way left turn lane. Where must you make your left turn from?
From that turn lane From the lane next to the center line From the right lane after signaling From whichever lane has less traffic Show the answer
From that turn lane
Where a street provides this turn lane, no other lane may be used for a left turn.
Source: Illinois Rules of the Road (2026), Chapter 10, Traffic Signals and Pavement Markings: Two-Way Left Turn Lanes (p. 80)
According to the Illinois handbook, when may you move back to the right after passing a vehicle?
When the entire vehicle shows in your rearview mirror As soon as your rear bumper clears its front After counting two seconds from passing it When its driver flashes the headlights Show the answer
When the entire vehicle shows in your rearview mirror
Wait until you can see the entire vehicle you passed in your rearview mirror.
Source: Illinois Rules of the Road (2026), Chapter 4, Traffic Laws: Passing (p. 28)
You are on a two-lane, two-way road in a posted Illinois school zone. May you pass a slower car?
Yes, if you stay under 20 mph Yes, if the center line is broken No, passing is not allowed there Yes, if no children are outside Show the answer
No, passing is not allowed there
Passing is off limits on these roads in any posted school zone.
Source: Illinois Rules of the Road (2026), Chapter 4, Traffic Laws: Passing (p. 29)
You began passing before an Illinois no-passing zone started, and a solid yellow line now appears on your side. What does the handbook allow?
Stopping in the left lane Crossing it to finish that pass Staying left until the zone ends Crossing it to begin a second pass Show the answer
Crossing it to finish that pass
You may cross the line to complete a pass you started before the zone began. You may also cross it to turn left into or from a driveway.
Source: Illinois Rules of the Road (2026), Chapter 10, Traffic Signals and Pavement Markings: Yellow No Passing Lines (p. 79)
In which direction does traffic move around the central island of an Illinois roundabout?
Counter-clockwise It depends on the time of day Either direction Clockwise Show the answer
Counter-clockwise
Traffic moves counter-clockwise, and you enter by turning right when it is safe.
Source: Illinois Rules of the Road (2026), Chapter 4, Traffic Laws: Rotary and Roundabout (p. 32)
May you flash your turn signals to tell the driver behind you it is safe to pass in Illinois?
Yes, but only in daylight Yes, on two-lane roads only No, this courtesy signal is illegal Yes, if the road ahead is clear Show the answer
No, this courtesy signal is illegal
Illinois law does not let you use turn signals to offer a courtesy or to tell someone to pass.
Source: Illinois Rules of the Road (2026), Chapter 4, Traffic Laws: Passing (p. 28)
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About these questions
We wrote these practice questions from the facts in the Illinois Rules of the Road (2026 (DSD A 112.47, printed July 2026) edition) and from official sources on road signs. Every answer links to its source, so you can check it and read more.
DMV Decoded is an independent guide, not a government agency. This practice test is not connected to the Illinois Secretary of State, and your actual test will have different questions. Study the handbook, and check the agency's website for current rules.
