Time for SDOT’s weekly roundup of weekend traffic alerts. Some biggies this time, particularly the Seafair Torchlight Run and Parade – the run will close the Alaskan Way Viaduct‘s northbound lanes from about 5:30-7 pm on Saturday, as well as the downtown route that then will stay closed for the parade till late evening. (Here’s our story on the West Seattleites in the parade.) And that’s not the only big weekend event. Here’s the full SDOT rundown.