September 2017 Vol. 25, No. 3

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Which vehicle is at fault?

Multi-lane roundabouts tend to see an increase in crashes due to failure to yield and improper lane use violations. Which vehicle is at fault in these diagrams? Answers are below.

And see the related article for more from Thinking of Building a Multi-Lane Roundabout? from the LRRB. The diagrams, which are included in the document, are courtesy of Washington County.

roundabout use diagram

Some drivers may incorrectly perceive roundabout entry as a “right turn” or “merge” situation. When they do, drivers in the right-hand lane may fail to yield to the left lane of cross traffic, leading to a collision. In this diagram, Vehicle 1 is at fault for failing to yield to both lanes of cross traffic.

Some drivers may incorrectly perceive the roundabout as being a “circle road” and therefore may disregard lane use signs and instead attempt to turn left from the right-hand lane, thus cutting in front of the vehicle next to them. In this diagram, Vehicle 1 is at fault for failing to position itself in the left-hand lane prior to turning left within the roundabout.