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 traffic circle was constructed in Duvall to replace an uncontrolled intersection on Northeast 124th Street in 2004, marking the first of its kind on a rural road in Western Washington. The project received approval from local residents, and WSDOT completed another roundabout at the highway's southern end with SR 202 in Fall City in 2008 for $4 million.