Washington State Route 599 is a highway entirely within the city of Tukwila, Washington. It extends 1.75 miles from its intersection with Interstate 5 in the southeast to its intersection with Washington State Route 99 in the northwest.
External links
Highways of Washington State (http://www.angelfire.com/wa2/hwysofwastate/sr599.html)
Odd-numbered routes stretch from U.S. Route 101 (functionally a StateRoute 1) in the west to StateRoute 31 in the east.
The next strip runs from StateRoute 14 (former StateRoute 12 before U.S. Route 12 was extended into the state) north to StateRoute 20, and the eastern strip runs from StateRoute 22 to StateRoute 28 (formerly to StateRoute 30, now part of SR 20).
As a result, many ferry routes are part of highways which share numbering at their start and end points, such as StateRoute 104 on the Edmonds to Kingston run.
StateRoute 99 (also known as Pacific Highway South, International Blvd., West Marginal Way, East Marginal Way, Aurora Avenue North, Highway 99, Pacific Highway North, Evergreen Way, and Everett Mall Way), is a numbered statehighway in Washington extending just over 50 miles from Fife in the south to Everett in the north.
SR-99 is primarily the route of US-99 where building Interstate 5 would have been prohibitively expensive, or would not have served the greater good.
As I-5 was built the PSH and US routes were moved to the new alignments from state line to international border until I-5 began being designated over the route.