Over the last 18 months, the Tulalip Tribes, together with the Federal Highway Administration, Washington State Department of Transportation, City of Marysville, and other key stakeholders, have been considering ways to address the project purpose and need. A number of options have been screened based on their ability to reduce traffic congestion on 4th and 88th Streets and I‐5, provide emergency access to and from the Tulalip Reservation, maintain business access, and improve fish passage along Coho Creek.
In August, a preferred solution was selected and is being advanced for environmental scoping and preliminary design. The preferred solution includes a series of roundabouts along both 4th and 88th Streets.
A modern roundabout is a circular intersection where drivers travel counterclockwise around a center island. There are no traffic signals or stop signs in a modern roundabout. Drivers yield at entry to traffic in the roundabout, then enter the intersection and exit at their desired street. Studies by the Federal Highway Administration have found that roundabouts can increase traffic capacity by 30 to 50 percent compared to traditional intersections. They are also proven to be safer than traditional stop sign or signal‐controlled intersections.