I-405 Express Toll Lanes - Improvements

WSDOT is listening to feedback from express toll lane drivers to help improve express toll lane experience and performance. While some adjustments are still under evaluation, others have already been implemented.

We want to hear from you.

map of improvements on I-405 express toll lanes


Completed adjustments

  1. SB I-405 at NE 160th St. - Added skip stripes to better define the start of second express toll lane and inside general purpose lane. (Oct. 1, 2015)
  2. NB I-405 at NE 6th St. - Added clarifying pavement markings to eliminate driver confusion and extended existing access point. (Dec. 18, 2015)
  3. SB I-405 at SR 527 - Lengthened access point to the north to allow drivers more time to merge into and out of the express toll lanes. (Dec. 18, 2015; June 2, 2016)
  4. NB I-405 at I-5 - Lengthened access point to allow drivers additional time to merge to I-5. (Jan. 22, 2016)
  5. NB I-405 access at SR 527 - Lengthened access point to allow drivers additional time to merge in and out of the express toll lanes. (Jan. 22, 2016)
  6. SB I-405 at NE 6th St. - Added pavement markings to clarify for drivers the exit to NE 6th St. and which lane continues onto I-405 southbound. (Feb. 25, 2016)
  7. NB I-405 at SR 520 - Lengthened access point and changed from weave lane to skip stripe to provide more open access to the express toll lanes. (March 18, 2016)
  8. NB at NE 160th St. - Added additional signage and lengthened access point to provide driver clarity and more time to merge to SR 522. (April 17, 2016)
  9. SB SR 522 to NE 160th St. - Adjusted access to address demand during morning peak commute. (April 17, 2016)
  10. NB I-405 between SR 527 and I-5 - Added a new peak-use shoulder lane, which opens the shoulder lane as a regular travel lane during times with heaviest traffic. Construction ($10 million) funded with I-405 express toll lane revenue. (April 24, 2017)
  11. NB I-405 north of NE 195th St. - Added weave lane to access point for drivers to use for transitioning to the general purpose lanes. (May 10, 2017)
  12. NB I-405 at NE 85th St. - Adjusted the access length on two occasions to provide more open access to the express toll lane. (June 19, 2017)

* Weight restrictions (pdf 143 kb) are in place at all times.



13. Entire corridor - WSDOT continues to make changes to the algorithm which calculates toll rates to respond to the demand for the lanes and to keep the express toll lanes moving.

Evaluating future projects

14. NB I-405 between SR 520 and NE 70th Pl. - WSDOT evaluated the benefits of a northbound I-405 auxiliary lane in this area and determined that this project has fewer traffic benefits than project #15 outlined below. This project has been deleted from the priority list in the 2018 Supplemental transportation budget.   

15. NB and SB 3-lane section between SR 522 and I-5 - Evaluate options to address limited capacity in section of I-405 with single express toll lane.
- Timeline: Initial study began in spring 2016 with initial $5M provided by the Legislature in the 2017-19 Transportation budget. The 2018 Supplemental transportation budget includes an additional $3 million in the 2017-19 biennium and another $12 million in the 2019-21 biennium to continue preliminary engineering. $15 million is funded with express toll lane revenue previously allocated to the SR 520 to NE 70th Place auxiliary lane project. 
- Cost: Phase 1 improvements (extending the dual express toll lane between SR 522 and SR 527 and building direct access ramps at SR 522 and SR 527) estimated at $450 million for construction.