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.