A major closure of Interstate 90 at Mercer Island is causing headaches for drivers trying to get to Seattle. Here's what WSDOT said Friday night: People need to stop using WB I-90 to get to Seattle. Drivers are going onto Mercer Island, using city streets and rejoining I-90 at the West Mercer Way on-ramp. The thousands of extra cars have created gridlock on I-90. >>https://kiro.tv/3C6F8k4 | KIRO 7 News