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SR 28/5th Street Roundabout

A new Sign

Post Date:10/10/2017

Construction Review – Active Projects

SR 28/5th St. NE Roundabout

5th St. RAB re-signed

A new sign is going up at the SR 28/5th Street Roundabout to help ease traffic flow on to the George Sellar Bridge. Monday, an electronic sign with a message reading “RIGHT LANE YIELDS” will be in place at the roundabout’s exit onto the bridge. Roundabout traffic heading onto the bridge will know they have the right of way and drivers on southbound SR 28 already know they have to yield to the traffic exiting the roundabout.

Monitoring traffic at the SR 28/5th Street roundabout at the east end of the Sen. George Sellar Bridge after it first opened, prompted WSDOT to make striping and signing changes Sept. 21, ending the “zipper merge.” This was done to improve the flow of traffic onto the bridge and to prevent traffic from backing up into the roundabout.

However, some drivers coming from the roundabout onto the bridge are still trying to zipper merge. Roundabout drivers are stopping to let Southbound Sunset Highway slip-lane traffic in. At the same time, the Sunset drivers are trying to yield to the roundabout traffic, resulting in both lanes being clogged.

We found traffic in the right lane has a clearer view of the traffic it is yielding to as it approaches the roundabout. It is easy for traffic in that right lane to gauge whether they should speed up or slow down to smoothly find gaps in traffic and yield efficiently.

The roundabout opened to traffic on August 30. The final step, seeding and landscaping, was finished Tuesday.

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