The roadway's busiest segment in 1970 was the Granite Falls city limits and the eastern terminus, with a daily average of 3,300 motorists each.

The freeway was the busiest segment of the highway in 2007, with an estimated daily average of 27,000 motorists.

In 1970, the busiest segment was the US 101 intersection in Raymond, with an estimated daily average of 4,800 motorists.

The busiest segment of the Empire Corridor is between New York City and Albany with multiple trains per day.

The busiest segment on the highway was east of Colville with a daily average of 1,400 in 1960.

The busiest segment on the highway was the southern terminus near Diamond Lake, with a daily average of 600 in 1960.

The Nevada Drive junction in Kelso was the busiest segment in 1970, with an estimated daily average of 6,800 motorists.

The intersection was also the busiest segment in 1991, with an estimated daily average of 4,150 motorists.

The busiest segment of the street is the SR 411 intersection, with an estimated daily average of 15,000 motorists in 2007.

The busiest segment in 1970 was the Maple Street junction in Downtown Centralia, with an estimated daily average of 14,000 motorists.