During typical traffic, the I90 HOV lanes from Mercer Island into Seattle keep flowing and provide incentive to carpool. However, they become heavily congested on days with large events and are particularly bad due to today’s massive Seahawks parade. (The lanes are single occupant from Mercer Island, but HOV 2+ from the Mount Baker tunnel into Seattle).
I90 HOV lanes backup
The screen shot above shows traffic backed up on the HOV exit ramp to 5th Ave S & Dearborn while the image to the right shows the backup in the HOV lanes with the Mount Baker tunnel in the background. The empty lane in the middle of this image is the Rainier flyer stop for buses which gives taking the bus a advantage. However, that lane has to merge just outside of the view of this image so the advantage to taking the bus is small.
In the future, Sound Transit’s East Link Light Rail will improve capacity by allowing for up to 4 car trains accessing Downtown Seattle via dedicated right of way. Until 2023, however, we’re stuck in traffic on heavy event days unless the political will to convert the HOV ramp to 3+ passengers between the flyer stop and Dearborn can be found.