road that passes the Sacramento Executive Airport and Sacramento City College. Freeport Boulevard turns to the northwest at about 4th Avenue. It was formerly a one-way pair with 21st Street with Freeport heading one-way southbound and 21st heading one-way northbound. The city converted these streets back to two-way streets for traffic calming purposes in 2008. After a short jog west on Broadway, former SR 160 turns north on the one-way pair of 15th (southbound) and 16th (northbound) Streets, almost immediately crossing Business 80 and entering downtown Sacramento. 15th and 16th Streets lead traffic north past the east side of the State Capitol grounds, which lie between L and N Streets. At F Street, the path of southbound SR 160 jogged west for three blocks to 12th Street; both 12th and 16th Streets pass under the Union Pacific Railroad's Martinez Subdivision (where B Street would be) in four-lane subways, but 15th Street dead-ends. 12th Street remains a one-way southbound roadway, but the two-way RT Light Rail now occupies its east side. 12th Street turns northeast at North B Street, and the two directions of former SR 160 come together at Richards Boulevard, just south of the 16th Street Bridge over the American River and the south end of the state-maintained North Sacramento Freeway. The light rail, which crosses the river between the two directions of SR 160, soon leaves at the Del Paso Boulevard interchange as the freeway turns east. Two folded diamonds at local streets and a northbound-only entrance ramp from Tribute Road are all that remains before SR 160 merges with Business 80 at the Arden Way interchange. Business 80 is also known as the Capital City Freeway here. The northern portion is also part of the California Freeway and Expressway System, as is the piece south of SR 12 near Rio Vista, though, of the latter, only the southernmost piece in Antioch is built to freeway standards. The northern piece and the southern piece south of SR 12 are also part of the National Highway System, a network of highways that are considered essential to the country's economy, defense, and mobility by the Federal Highway Administration. The entire southern portion, from SR 4 to Sacramento, is eligible to be included in the State Scenic Highway System, and is officially designated as a scenic highway by the California Department of Transportation, meaning that it is a substantial section of