More than 170,000 drivers will need to change their plans this weekend while construction crews close most of Highway 18 in Auburn.
Downtown Seattle will be a maze as well, as streets close for Seafair events and fire-suppression maintenance over Interstate 5.
This weekend in Auburn, crews are building a 120-foot-deep, 8-foot-diameter column foundation in the median of Highway 18, to support a new bridge over Highway 167. This narrow bridge will carry the new southbound high-occupancy or toll (HOT) lane, which allows solo drivers to pay for a faster trip in the same lane as buses and carpools.