277th Street in Kent. Approximately 8 percent of all traffic on the highway is freight, mainly serving industrial areas in the Green River Valley. History Modern-day settlements in the area between Puyallup and Renton were established in the late 19th century along the Puget Sound Shore Railroad, which opened in 1885 as the first north–south railroad in the Puget Sound region. A series of wagon roads following the railroad and the White River (later replaced by the Green River) in the valley were built within a decade. The corridor was proposed as an addition to Washington's state highway system as early as 1909 and was ultimately added in 1913 as part of the Pacific Highway, although most of this was then deleted in 1923. The only portion kept was that between Auburn and Renton, which became part of State Road 5. The rest of the route (between Auburn and Tacoma) was added back to the state highway system two years later in 1925, also as a part of State Road 5. This route was extended north along Rainier Avenue into Seattle in 1937. When Washington's current numbering system was developed with the 1964 renumbering, State Route 167 followed what is now State Route 164 from Enumclaw to Auburn before turning north towards Renton and Seattle. What is now SR 167 between Tacoma and Auburn was numbered U.S. Route 410 (later SR 410) between Tacoma and Sumner, and State Route 163 between Sumner and Auburn. These highways were renumbered to their current designations in 1973. The highway between Renton and Seattle was removed from the state highway system in 1991, although the law did not take effect until April 1, 1992. The Puyallup River bridge on Meridian Avenue was built in 1925 and twinned with the addition of a two-lane bridge for southbound traffic that opened in 1971. The northbound truss bridge was replaced in 2015, with the original structure moved to a nearby plot of vacant land while awaiting a sale. The northern half of the Renton interchange with I-405 was altered in 2003 to separate weaving traffic through the use of a flyover ramp that leads into the southbound-to-southbound loop ramp. The overloaded interchange with I-405 resulted in routine backups on I-405 as far as Tukwila to the west and the Kennydale Hill to the north. A larger overhaul was proposed as part of Referendum 51, which was rejected