SEATTLE – As the viaduct is almost completely shut down, many wonder how long it will take them to get there go & go. Much depends on where people live, but research has been done to find out where the choke points have formed in the past.
INRIX, the Kirkland-based transportation consultancy, analyzed how the work routes were when the viaduct closed for nine days in 2016.
A review of the data shows that alternative routes in the heart of Seattle were overwhelmed. The 1st Ave S and the 4th Ave S between the stadiums and Spokane Street saw a 29% increase in travel time. That could extend a one-hour ride by 20 minutes.
Commuters from the north also crawled. Motorists moved 44 percent slower on the I-5 around the Ship Canal Bridge, and an hour's drive took an hour and 25 minutes.
"I think it's going to be tough when I'm in Seattle, but frankly, I tend to drive most of the time on the Eastside 405," said Hank Burton, who commuted every working day by car.
 However, I-405 was hit hard as well, driving times between the SR 167 and the I-90 Floating Bridge increased by 18 percent, extending a one-hour ride by 12 minutes.
Some of the worst traffic jams were on average I-5 south of the city they were traveling in. The number increased by 51 percent.
"All the other drivers there are fine and stay safe in this crazy weather," said Lina Olund, an Uber driver
As for the INRIX, the Aurora Bridge still worked and Ballard Bridge ran smoothly most of the time, with the West Maple Valley Highway and I-405 north of the SR 520 Bridge also avoiding most of the impacts.