The One Center City (OCC) Advisory Group, tasked with developing a plan to increase mobility in central Seattle during the impending period of maximum constraint, released its recommendations for near term capital projects in June. The plan must still be approved by the Seattle City Council and other stakeholders.
Early discussions proposed transformational changes downtown and large-scale bus service restructuring, neither of which materialized in the final list of projects and improvements.
The OCC group was formed in order to proactively keep megaproject-related pain to a minimum over the course of 2019-21. During that time, Highway 99 will move from the viaduct to the new deep-bore tunnel, the Washington State Convention Center expansion will close critical parts of the grid, a critical bridge in South Lake Union will be closed and rebuilt, and the transit tunnel will close to buses forever.
5th and 6th Avenue northbound lanes; 4th and 2nd Avenue improvements
The most significant changes that the OCC group endorsed are northbound transit-only lanes on 5th and 6th Avenues. Some Metro routes will move to those streets from 4th, while Community Transit and Sound Transit buses would remain in their original configuration.
The hope is that the 4th Avenue buses will benefit from a lower volume of bus traffic. SDOT would also invest in queue jumping and signal priority for buses on both 2nd and 4th. However, since overall traffic on all downtown streets is expected to increase during the period of maximum constraint, the gains for 4th Avenue buses might be marginal.