The US has seen a significant increase in roundabout construction in the past 15 years — from fewer than 1,000 in 2000 to over 8,000 by 2024 (FHWA data). States like Indiana (Carmel alone has 125+), Arizona, and Kansas have become roundabout-heavy, and road tests in these areas increasingly include roundabout navigation. This guide covers the complete US roundabout rules.
Key Takeaways
- At US roundabouts: vehicles INSIDE the roundabout have the right-of-way over entering vehicles
- Yield to traffic already circulating before entering the roundabout
- Single-lane roundabouts: yield and enter any gap in the circle
- Multi-lane roundabouts: choose the correct entry lane based on your exit
- Roundabouts are tested on road tests in Indiana, Arizona, Charlotte, NC, and other roundabout-heavy areas
At all US roundabouts, entering vehicles yield to traffic already circulating in the roundabout. You must wait at the yield line until there is a safe gap in circulating traffic before entering.
This is opposite from older "rotary" rules in some states (Massachusetts, some Connecticut rotaries) where entering traffic had priority. Modern roundabouts always follow the yield-to-circulating-traffic rule.
Multi-lane roundabouts require lane selection before entering:
For exiting right (first exit, approximately 90° turn):
For going straight (approximately second exit, 180°):
For turning left (third or fourth exit, 270°+ turn):
"Multi-lane roundabout errors are the most common failure point for roundabout-related road test observations. Lane changes inside the roundabout — especially cutting across lanes on exit — are cited as the primary safety violation." — FHWA Roundabout Safety Research, 2024
Roundabouts are designed for low speeds:
If an emergency vehicle approaches while you are in a roundabout:
Some older traffic circles in Massachusetts, Connecticut, and New England are labeled "rotaries" and may have entering traffic yield rules that are different from modern roundabouts. Massachusetts rotaries operated by older laws give the right-of-way to vehicles already IN the rotary (same as modern roundabouts). Some very old rotaries still operate differently — look for signs.
Practice roundabout and other driving rules on Wheelingo.
Who has the right-of-way at a roundabout? Vehicles already circulating inside the roundabout have the right-of-way. Entering vehicles must yield at the yield line until there is a safe gap.
Do I need to signal in a roundabout? In most states, signal right as you approach your exit within the roundabout. At entry, signal left if you plan to go more than halfway around the circle (varies by state practice). Check your state's specific guidance.
What if I miss my exit in a roundabout? Simply continue circulating and take the next opportunity to exit at your intended exit. Do not stop in the roundabout or reverse.
What lane do I use in a multi-lane roundabout? Choose based on your intended exit: right lane for exiting right/straight, left lane for exiting left (going most of the way around). Follow any lane markings posted on the road surface.
Are roundabouts safer than traditional intersections? Yes — FHWA data shows roundabouts reduce serious injury crashes by approximately 75% compared to traditional signal intersections. The absence of high-speed right-angle collisions is the primary reason.
How fast should I drive inside a roundabout? Typically 10-20 mph inside the circle. Posted speed on the approach sign indicates the recommended entry speed (usually 15-25 mph).
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