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SR 9 - 176th Street SE to SR 96 - Widening - Interim improvement design options

WSDOT may use a combination of measures to provide limited congestion relief on SR 9 through Clearview. These interim improvements will be implemented in phases, as determined by ongoing traffic monitoring.

The options selected are the result of meetings with the Clearview Community Association, a community open house in January 2017, and consultations with Snohomish County Public Works.

Improvements goal
The goal is to provide limited northbound congestion relief on SR 9 between 176th Street Southeast and SR 96.

Improvements for traffic signal modification completed in April 2017.

  • SR 9 at 164th Street Southeast: The traffic signal will be reconfigured to provide more green light time to northbound drivers (work completed April 1, 2017).
    • Benefit: Eastbound and westbound drivers will travel simultaneously through the intersection instead of each side taking its own turn. In addition, northbound and southbound traffic on SR 9 will be allowed to turn left on a flashing yellow arrow. These changes in the traffic signal cycle will increase the green light time for northbound/southbound traffic on SR 9 and reduce backups.
  • SR 9 at at Cathcart Way and 176th Street Southeast: A flashing yellow arrow was added to the existing traffic signal cycle for left turns (work completed Sunday, April 9, 2017).
    • Benefit at Cathcart Way: The number of northbound drivers turning left onto Cathcart Way frequently exceeds the capacity of the turn lane. This results in backups on SR 9, which blocks through-traffic. By allowing drivers to turn left on a green light or a flashing yellow arrow, the backups in the left turn lane will be minimized and reduce the blocking that occurs on the SR 9 through-lane. Several community members suggested this improvement at the open house in January 2017.
    • Benefit at 176th Street Southeast: This change will keep traffic moving at the intersection and discourage frustrated drivers from traveling farther north and turning left to cut through a shopping area parking lot.

A small thumbnail image of a video showing details of retimed and reprogrammed traffic signals at three intersections on SR 9.

Other improvements remain as options

  • Add a second lane from 176th Street Southeast to north of 164th Street Southeast.
    • Presented as Option 1 at the January 2017 open house, WSDOT will consider building a second northbound lane following traffic studies analyzing the results of previous improvements.
    • This option requires diverting $3 million from design and right-of-way acquisition for the overall widening project. It would not include U-turn locations and may present some difficulties for drivers turning left from side streets and driveways. Because there is no funding for the full widening project yet, the configuration could be in place indefinitely.

A small thumbnail image of a video showing details of an addition northbound lane on SR 9.

  • SR 9 at Cathcart Way turn lane lengthening: Lengthen the northbound left turn lane to Cathcart Way by 180 feet.
    • If changing the traffic signal doesn’t reduce or nearly eliminate the backups, the left turn lane can be lengthened to increase capacity for vehicles.

A small thumbnail image of a video showing details of an extended northbound SR 9 left turn lane to Cathcart Way.