A roundabout was constructed in southern Duvall to replace the unsignalized intersection at Northeast 124th Street in 2004, the first to be built on a rural highway in Western Washington, and received favorable feedback from local residents. WSDOT completed construction of a second roundabout in 2008 at the highway's southern terminus with SR 202 in Fall City, costing $4 million.
A circular intersection was built in Duvall to replace an unmarked junction on Northeast 124th Street in 2004, being the first of its kind on a rural road in Western Washington. WSDOT completed another roundabout at the highway's southern terminus with SR 202 in Fall City in 2008 for $4 million.