In a roundabout, drivers already inside the circle have the right of way. Anyone approaching an entrance must yield to vehicles coming from the left within the circulating roadway and wait for a safe gap before merging in. That single rule answers the question of who has the right of way in a roundabout, and it governs almost every roundabout in the United States.
The Yield-at-Entry Rule
The Federal Highway Administration describes roundabouts as having “entry yield control that gives right-of-way to circulating traffic.”1Federal Highway Administration. Roundabouts You never force your way in. You wait at the entrance until there is a safe gap in the traffic already moving through, then merge. Once you are inside, you have priority over anyone still waiting to enter at the next approach.
This rule exists because of how general traffic law works. The Uniform Vehicle Code normally gives right of way to the vehicle on the right when two cars reach an intersection at the same time. Roundabouts flip that default because circulating traffic approaches from the left. To avoid confusion, yield signs and yield lines are required at every roundabout entrance. The federal Manual on Uniform Traffic Control Devices mandates a yield sign at each approach and prohibits yield signs on the circulating roadway itself, reinforcing that traffic inside the circle always has priority.2Federal Highway Administration. MUTCD 11th Edition Chapter 2B
How to Enter Safely
Slow down well before the yield line. Check the crosswalk first, which sits about a car length before the yield line on most roundabouts. Pedestrians have the right of way there. Once the crosswalk is clear, look left for circulating traffic. If nothing is coming from the left inside the circle, you can merge without stopping completely. If traffic is flowing, wait at the yield line for a gap large enough to enter smoothly without forcing a circulating driver to brake.
A common mistake is treating the yield sign like a stop sign. You do not need to come to a full stop if the roundabout is empty. The opposite mistake is just as common: rolling through the yield line without genuinely checking left. Both errors cause crashes. The goal is a smooth, cautious merge at low speed.
Pedestrians and Cyclists Have Priority Too
Pedestrian crosswalks at roundabouts are set back from the yield line by about one car length, and almost all modern roundabouts split each crossing in two using a splitter island.3Federal Highway Administration. Roundabouts An Informational Guide Pedestrians cross to the island, pause in the refuge area, and cross the second half. You may have to yield to pedestrians twice at the same approach: once entering and once exiting, because the exit lane crosses a pedestrian path as well.
Cyclists have a choice. They can ride in the travel lane like any other vehicle, follow the yield-at-entry rule, and take the full lane to discourage unsafe passing. Many roundabouts also provide a ramp from the bike lane to a shared-use path that loops around the outside, so cyclists can navigate as pedestrians would.4Federal Highway Administration. Roundabouts with Pedestrians and Bicycles When a cyclist is riding in the lane, treat them as a vehicle for right-of-way purposes.
Right of Way in Multi-Lane Roundabouts
Multi-lane roundabouts add a layer of complexity because you need to pick the correct lane before entering. Lane-use signs and pavement arrows on the approach tell you which lane corresponds to which exit. Typically the right lane handles right turns and sometimes straight-through movements, and the left lane handles left turns and U-turns. Get into the right lane well before the yield line. Changing lanes inside the circle is both dangerous and prohibited in most jurisdictions.
Once inside, stay in your lane through the entire roundabout until you reach your exit. A driver in the outer lane should never try to continue circulating past an exit where an inner-lane driver is leaving. The inner-lane driver headed for the exit has the right of way to cross the outer lane. This side-by-side conflict is the most common crash pattern unique to multi-lane roundabouts, and it is almost always caused by someone drifting out of their lane or failing to exit when they should.
Signaling Your Exit
Activate your right turn signal as you approach the exit you intend to take. That tells drivers waiting to enter that you are leaving the circle, which helps them judge when it is safe to merge. If you are taking the first exit, signal right as you enter. If you are going straight through or turning left, wait to signal right until you pass the exit just before yours.
Spiral Lane Markings
Some newer multi-lane roundabouts use spiral lane markings or raised curbing that guides your vehicle from an inner lane outward toward your exit. Follow the lane lines and you end up in the correct position to exit without ever changing lanes yourself. If you see crosshatched pavement markings curving outward, that is the spiral guiding you.
Large Vehicles and Truck Aprons
Tractor-trailers and buses need more room to turn than passenger vehicles. Many single-lane roundabouts include a truck apron: a raised, textured ring of pavement around the central island that large vehicles can drive over when their turning radius exceeds the width of the circulatory lane.5Federal Highway Administration. Roundabouts An Informational Guide – Chapter 6 Geometric Design The apron has a raised outer edge and different surface texture to discourage passenger cars from using it.
At multi-lane roundabouts, a large truck may need to straddle both lanes to make it through the curve. Give it room. Do not try to squeeze alongside it. The geometry of the intersection simply requires a wider path for a 53-foot trailer. Buses on transit routes also need extra space, though designers try to size the roadway so scheduled buses can navigate without using the apron.6Federal Highway Administration. Roundabouts An Informational Guide
Emergency Vehicles
An emergency vehicle approaching with lights and sirens has the right of way over everyone. If you are already inside the circle, keep moving to your nearest exit, pull off to the right, and stop. Never stop inside the roundabout itself. That blocks the emergency vehicle’s path and creates a hazard.7Federal Highway Administration. Roundabouts and First Responders Saving Lives Together If you have not entered yet, stop before the yield line and let the emergency vehicle pass. The goal is always to keep the circulating lanes clear.
If You Miss Your Exit
Go around again. Missing your exit has no consequence beyond an extra loop. Stay in the circle, make another full lap, and take the exit on your next pass. Never stop, back up, or cut across lanes to reach an exit you have passed. A sudden maneuver like that is far more dangerous than spending an extra 15 seconds going around.
Who Is at Fault in a Roundabout Crash
The most common roundabout collision is an entering vehicle hitting a circulating vehicle. International data puts this crash type at 50 to 70 percent of all roundabout collisions.6Federal Highway Administration. Roundabouts An Informational Guide Because the yield-at-entry rule is clear and well-marked, the entering driver will almost always be found at fault. The logic is straightforward: you had a yield sign, a yield line, and a legal obligation to wait for a safe gap, and you did not.
Fault is not always 100-0. If the circulating driver was speeding, driving erratically, or changed lanes unexpectedly inside the circle, a portion of fault can shift to them. How much that matters depends on your state’s negligence rules. Most states reduce your compensation by your percentage of fault, and a handful bar recovery entirely if you are even slightly at fault. In a side-by-side crash in a multi-lane roundabout, fault usually falls on whichever driver left their lane or tried to exit from an inner lane across an outer-lane driver who had the right to continue.
The police report from the scene, photos showing final vehicle positions and the lane markings, and any witness statements are the most important pieces of evidence after a roundabout crash. Get them before you leave the scene if you can, because the physical evidence of who was where when the vehicles met is what sorts out right of way after the fact.