 Northwest traffic from the High Performance Homes Traffic Center. Heavy traffic down in Puyallup. Meridian is stop and go from the river to the fairgrounds. But the big story this weekend is that 405 is completely closed from Renton to Factoria. So lots of people are heading through downtown Seattle as an alternate route. Northbound I-5 is jammed up around Mercer Street. Westbound I-90 is backed up to Mercer Island. And the westbound 520 exit to northbound I-5 is closed this weekend as well. So westbound 520 is jammed up around Malt Lake Boulevard.