Kris Olsen, WSDOT Communications, 206-440-4704 (Shoreline)
Janice Fahning, WSDOT Project Engineer, 425-225-8725 (Everett)
BELLEVUE – Drivers can look forward to smoother sailing at three busy intersections when construction is completed this fall on new roundabouts.
On Monday, June 10, the Washington State Department of Transportation will begin building a roundabout near the Interstate 90 on- and off-ramps at West Lake Sammamish Parkway in Issaquah. The crews from contractor Graham-Marshbank JV will also begin work on two new roundabouts on State Route 92 near Lake Stevens. One roundabout is located at 99th Avenue Northeast. The second is less than a mile east at 113th Avenue Northeast.
“These roundabouts will make it safer and easier for drivers to enter or exit the highways,” said Janice Fahning WSDOT project engineer. “All of these intersections have experienced plenty of collisions. The traffic volumes are increasing as well. The roundabouts will help move traffic more efficiently and reduce collisions.”
Roundabouts reduced injury crashes by 75 percent at intersections where stop signs or signals were previously used, according to a study by the Insurance Institute for Highway Safety. Roundabouts also achieve a 37 percent reduction in overall collisions.
The I-90 to West Lake Sammamish Parkway intersection was the site of 41 collisions from 2006-2010. At SR 92, the intersections at 99th Avenue Northeast and 113th Avenue Northeast had a combined 42 collisions from 2006-2010.
Roundabouts also improve traffic flow because they promote the continuous movement of traffic. Studies by the Federal Highway Administration have shown a 30-50 percent increase in traffic capacity compared to traditional intersections.
Lane closure details
I-90 on- and off-ramp roundabout
SR 92 roundabouts at 99th and 113th avenues Northeast
All three roundabouts will be completed by early September.