Driving Tests

Wisconsin Roundabout Rules: Yield, Lanes and Large Trucks

informational·how to guide·Published April 1, 2026

Who yields in a roundabout in Wisconsin?

In Wisconsin, you yield to pedestrians and bicycles, and to traffic on your left that is already in the roundabout. State law also makes you yield to any vehicle at least 40 feet long or 10 feet wide that approaches or drives through at about the same time. Choose your lane before you enter, do not change lanes inside, and signal right to exit.

Where the roundabout rules come from

The large-vehicle rule is in Wisconsin Statutes s. 346.18 (8), from 2015 Wisconsin Act 139. The Wisconsin DMV Motorists' Handbook (2026 edition, Section 6 A) and the Wisconsin Department of Transportation (WisDOT) pages How roundabouts work and Roundabouts FAQ explain how to drive a roundabout. This guide is current as of 2026. Confirm the rules with the Wisconsin DMV (wisconsindot.gov) before you drive.

How to drive through a Wisconsin roundabout

1
Read the signs and choose your lane
Look at the signs above you and the pavement arrows as you approach. They show which lane you need. Move into that lane before you enter.
2
Slow down
Slow down as you reach the roundabout. Traffic inside moves counterclockwise.
3
Yield to people, to traffic on your left and to large vehicles
Yield to pedestrians and bicycles at the crosswalk. Then yield to all lanes of traffic on your left that are already in the roundabout, and to semitrucks.
4
Enter in a safe gap
Enter when there is a safe gap in traffic. If the roundabout is empty, you do not need to wait.
5
Keep your speed low and stay in your lane
Do not change lanes while you are in the roundabout.
6
Signal right and exit
As you reach your exit, turn on your right turn signal and exit. Yield to pedestrians and bicyclists as you leave.

Who has the right of way in a roundabout?

Traffic that is already in the roundabout has the right of way. This includes trucks and other large vehicles: they also yield to traffic inside before they enter. You do not have to stop at the entry, only yield, so a roundabout can handle more traffic in the same time. At a multi-lane roundabout, yield to all lanes of traffic on your left, so check both lanes before you go. The question on entering a roundabout tests this rule. A four-way stop has different rules: see the Wisconsin four-way stop rules.

Which lane do I use in a roundabout?

Lane choice is critical at a multi-lane roundabout, because you must not change lanes inside. Choose your lane before you enter. The overhead signs and the pavement markings show which lane to take: obey them.

As a general pattern, the left lane is for turning left, the right lane is for the next right turn, and a middle lane is for going straight. At a two-lane roundabout, some entries let you go straight from either lane, so the markings decide. The table shows the two-lane example of the Motorists' Handbook.

Lane choice at a two-lane roundabout

Lane choice at a two-lane roundabout
Where you want to go	Lane to use
Left turn or U-turn	Left lane
Right turn	Right lane
Straight ahead	The lane that the pavement markings, arrows or signs show (at some entries, either lane)

Roundabout signs to know

Roundabout Ahead: a diamond with a counterclockwise symbol and a plate below it that says "Roundabout Ahead". Slow down and get ready to choose a lane.
Lane-use sign: arrows show which lane goes where, and the dot marks the center of the roundabout. In the handbook example, only the left lane turns left or makes a U-turn, and the right lane goes straight or turns right.
Roundabout Exits: shows which road you will be on when you exit the roundabout. Read it as you approach to plan your exit.

Pedestrians and bicyclists at a roundabout

Yield to pedestrians at the crosswalk when you enter and again when you exit. A bicyclist can ride through the roundabout in the travel lane, or leave the road and use the crosswalk, so watch for both. WisDOT tells bicyclists inside the roundabout to ride close to the middle of the lane so that vehicles do not pass and cut them off.

What about trucks and other large vehicles?

Wisconsin law adds a duty for you. Under s. 346.18 (8), you must yield to any vehicle or combination of vehicles at least 40 feet long or at least 10 feet wide. The duty applies when it approaches or drives through the roundabout at about the same time as you, or so close that a crash could happen. If needed, slow down or stop to yield.

Examples are a tractor-trailer, a bus, a fire truck and farm equipment. Most large vehicles turn wider, and a commercial truck can weigh up to 80,000 pounds. The Motorists' Handbook puts it simply: yield to semitrucks.

What to do when you meet a large vehicle

A vehicle at least 40 feet long or 10 feet wide approaches or drives through the roundabout at about the same time as you

Yield to it. Slow down or stop if you need to.

You approach the roundabout beside or next to a tractor-trailer, bus, fire truck or farm equipment

Slow down or yield so that the large vehicle enters first and has space through the roundabout. The question on a semitruck at a two-lane roundabout tests this case.

Two vehicles that are each at least 40 feet long or 10 feet wide arrive at about the same time

The vehicle on the right yields to the vehicle on the left, and slows down or stops if needed.

Emergency vehicles at a roundabout

When an emergency vehicle with its siren on comes to a roundabout, you yield to it. What you do depends on where you are:

You have not entered yet: pull over and let the emergency vehicle pass.

You are already inside: exit safely at the next right, then pull over. Do not stop inside the roundabout, even if that exit is not yours. The question on an ambulance in a roundabout tests this rule.

Key takeaways

Traffic in a roundabout moves counterclockwise. Yield to pedestrians and bicycles, then to all lanes of traffic on your left.
Choose your lane from the signs and arrows before you enter. Do not change lanes inside, and signal right at your exit.
Yield to any vehicle at least 40 feet long or 10 feet wide that approaches or drives through at about the same time. Slow down or stop if you must.
Yield to an emergency vehicle with its siren on. If you are inside, exit at the next right, then pull over.
Next step: practice the roundabout questions on the free Wisconsin Class D practice test.

Wisconsin roundabout rules: common questions

Do I have to stop at a roundabout in Wisconsin?

No. Traffic at a roundabout is not required to stop, only to yield. Let pedestrians, bicycles and traffic on your left go first, then enter in a safe gap. If the roundabout is empty, you do not need to wait. Stop only when you must, to let someone go first.

Can I change lanes in a roundabout?

No. Do not change lanes while you are in the roundabout. Read the overhead signs and the pavement arrows early, and move into the correct lane as you approach. Then stay in that lane until you exit, and turn on your right turn signal as you reach your exit.

Do I have to yield to a semitruck in a roundabout?

Yes, when the semitruck approaches or drives through the roundabout at about the same time as you, or so close that a crash could happen. Wisconsin law covers any vehicle or combination of vehicles at least 40 feet long or 10 feet wide, such as a semitruck or a bus. Slow down or stop if you need to.

Do I use my turn signal in a roundabout?

Yes, at your exit. As you reach your exit, turn on your right turn signal to show that you will leave the roundabout. Until then, keep your speed low and stay in your lane. Yield to pedestrians and bicyclists at the crosswalk as you exit.

What do I do if an ambulance comes while I am in a roundabout?

Exit safely at the next right, even if it is not your exit, and then pull over. Do not stop inside the roundabout. If you have not entered yet, pull over and let the ambulance pass first. This applies to any emergency vehicle with its siren on.

Are roundabouts safer than regular intersections?

Yes. University of Wisconsin TOPS Lab data shows that changing a two-way stop intersection to a single-lane roundabout cut fatal and injury crashes by 51.9% in rural areas and 58.2% in urban areas. A roundabout eliminates head-on and T-bone crashes, and the low speeds make crashes less severe.