signed as State Route 178. Although it was proposed for signing as Route 178 in 1934, the segment of Legislative Route 58 between US 101 near Santa Margarita and State Route 33 at McKittrick was not signed prior to 1964. Note that US 466 was co-signed with US 99, now State Route 99, between Bakersfield and Famoso Junction. Between Famoso and US 101 at Paso Robles, US 466 largely became SR 46. The eastern terminus was originally at I-15 in northeastern Barstow. SR 58 was rerouted to I-15 in Barstow south of the I-40 interchange in . The former eastern terminus is now known as "Old Highway 58". Freeway bypasses in Tehachapi, Boron, Mojave, Hinkley, and Kramer Junction were completed in , 1981, 2003, 2017, and 2020, respectively. Westside Parkway and the Centennial Corridor Project In western Bakersfield, the Westside Parkway, a freeway running from Stockdale Highway (near Heath Road) east to Truxtun Avenue, was completed on April 15, 2015, with interchanges in between at Allen Road, Calloway Drive, Coffee Road, and Mohawk Street. Opening in stages since 2013, the road was originally under the jurisdiction of the city of Bakersfield. As part of the Centennial Corridor project, Caltrans is building an eastern extension of the Westside Parkway to the current junction of SR 58 and SR 99 at the West Bakersfield Interchange. Although construction was controversial since it displaced dozens of homes and businesses, by September 2017, all but a few buildings in the path had been demolished. In October 2022, city officials announced that the project was nearly complete, and that they were working on the last 800 feet of the connection, specifically, the northbound SR 99 to westbound Westside Parkway (future SR 58) transition ramp, with an estimated 8 months of construction left. Once the connection to SR 99 is completed (which is expected to occur in fall 2023), SR 58 will then be rerouted onto Stockdale Highway and the Westside Parkway, with later plans to upgrade Stockdale Highway from Heath Road west to Interstate 5 as a freeway. Bakersfield has already begun the transfer process, and the Westside Parkway is under Caltrans and California Highway Patrol jurisdiction effective February 5, 2021. Business loops Mojave State Route 58 Business is a business route of California State Route 58 in Mojave. It provides access to downtown Mojave as Mojave-Barstow Highway. It also follows mostly the former routing of