Requires the department of transportation to work with the city of Mercer Island and other appropriate parties to allow the portions of the planned westbound high occupancy vehicle lane on Interstate 90 between Island Crest Way and West Mercer Way to be accessed by vehicles using the westbound on-ramp from Island Crest Way.

Prohibits the department from closing or restricting the westbound on-ramp from Island Crest Way to the current westbound Interstate 90 general purpose lanes until a mutually acceptable agreement between the department and the city has been reached.