 The state government also improved existing sections of 4th Street in the 1970s and constructed an extension of 64th Street Northeast to reach SR 9 in the 1980s.The I-5 interchange was expanded in the 1970s and rebuilt in 1993 with wider ramps and a new traffic signal, funded by a federal grant.A section of SR 528 from 64th Avenue Northeast to SR 9 was widened to four lanes in 2000.