Roundabout Ahead Sign
The roundabout ahead sign warns that a traffic roundabout is located ahead. Drivers entering a roundabout must yield to vehicles already circulating inside the circle.
Last updated: April 4, 2026
A roundabout is a circular intersection where traffic flows counterclockwise around a central island. All vehicles entering the roundabout must yield to traffic already in the circle. Roundabouts eliminate the left-turn conflict common at four-way intersections and are statistically safer than traditional intersections. The sign warns drivers to prepare to yield and to choose the correct exit lane before entering.
Quick Facts
Type
Warning Sign
Shape
Diamond
Colours
Yellow background with black circular arrows symbol
In this guide
What does the Roundabout Ahead Sign mean?
A roundabout is a circular intersection where traffic flows counterclockwise around a central island. All vehicles entering the roundabout must yield to traffic already in the circle. Roundabouts eliminate the left-turn conflict common at four-way intersections and are statistically safer than traditional intersections. The sign warns drivers to prepare to yield and to choose the correct exit lane before entering.
What to do when you see it
Reduce speed and look for vehicles in the roundabout. Yield to all circulating traffic before entering. If multiple lanes exist, choose your lane before entering based on your exit: right lane for the first exit, left lane for later exits. Signal before exiting. Do not stop inside the roundabout.
Where you'll see it in Ontario
Roundabouts are increasingly common in Ontario. They are found at intersections in new residential developments in Vaughan and Markham, on rural highways where intersection collision rates were high, and at university and hospital campus entrances.
G1 test relevance
Roundabouts are a growing part of the G1 test curriculum as they become more common across Ontario. The key rule is that entering traffic must yield to circulating traffic. Candidates must also know not to stop inside the roundabout and how to signal when exiting.
Common mistakes drivers make
Entering the roundabout without yielding to circulating traffic is the most dangerous mistake. Another error is stopping inside the roundabout and confusing following drivers. Some drivers also use the wrong lane for their exit, forcing a late lane change inside the circle.
Related Signs
Yield Sign
The yield sign is a downward-pointing triangle that requires drivers to slow down and give the right-of-way to traffic already in the intersection or roadway. You must stop if necessary, but you do not have to stop if the way is clear.
Learn moreIntersection Ahead Sign
The intersection ahead sign warns that a cross street or side road is coming up. It is placed where the intersection is not clearly visible in advance, such as on a hill or after a curve.
Learn moreKeep Right Sign
The keep right sign instructs drivers to stay to the right side of a traffic island, obstruction, or divided road median. It directs traffic flow at road splits and median openings.
Learn moreMerge Sign
The merge sign warns that two lanes of traffic will combine into one ahead. Drivers must adjust their speed and position to merge smoothly and safely.
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