Design Features Double Roundabout

Some people love them; others hate them.No matter your feelings regarding roundabouts, engineers studied our challenging intersections at 166th Avenue and SR 410 and found that a double roundabout is the best solution.

The issue here is that the SR 410 ramps are too close to the 166th Avenue/64th Street intersection for a traditional signal in both locations, yet both need a controlled intersection. The solution is a double roundabout that gets drivers to SR 410, 166th Avenue, Sumner-Tapps Highway and 64th Street in the most efficient and safest way possible.

This is Sumner’s first roundabout, let alone its first double roundabout. We have funding for design
only, not construction, so you won’t see this being built yet.

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