SeaTac International Airport in the inner southern suburbs of Seattle and passes very close to Boeing Field (also known as King County International Airport). As the freeway heads towards Downtown Seattle, reversible lanes, or express lanes, branch off the mainline and continue north through the city. The express lanes carry southbound traffic in the morning and northbound traffic in the afternoon. The Express Lanes merge with the main line in the Northgate area of North Seattle. After that, I-5 continues north through the cities of Shoreline, Mountlake Terrace, and Lynnwood. In Lynnwood it merges with Interstate 405 again. It continues north to the last large city in Seattle Metro area, Everett. It was built in South Tacoma between 1955 and 1957, North Tacoma to Kent between 1959 and 1961, between Kent and downtown Seattle in 1966, from downtown Seattle to Roanoke Street in 1964, from Roanoke Street to Lake City Way/SR 522 in 1960, and north of there to Everett in 1964. Interstate 90 Interstate 90 goes east out of Seattle, eventually terminating in Boston. The freeway was originally built in 1940 from Rainier Avenue to Issaquah. It passes through the Eastside's largest city, Bellevue, and skirts the north side of Factoria Mall in Bellevue, where it interchanges with the north–south Interstate 405. Then the freeway continues east and passes through Issaquah, Snoqualmie, and North Bend before climbing into the Cascade Mountains. The freeway originally consisted of four lanes, and crossed the Lacey V. Murrow Floating Bridge. In the early 1950s, an interchange was built at Rainier Avenue and the highway extended 1 mile closer to Seattle's city centre along "Corwin Place". In the early 1960s, traffic congestion forced the Department of Highways to institute a tidal flow system, in which three lanes, controlled by overhead signals went into Seattle in the morning, and toward Bellevue in the afternoon. In 1968, improvements to the east of Mercer Island were made; the highway was widened to up to 6 lanes in each direction and the interchange with I-405 was upgraded from a cloverleaf to a fully directional interchange. Litigation kept the 7-mile section between Bellevue and Interstate 5 from being upgraded until the 1980s, at which time a new bridge from the Eastside to Mercer Island was built and the dangerous "bulge" was removed from the Lacey V. Murrow Floating Bridge. In 1990, the renovations/widening of the freeway were completed, including