Early plans also included a north–south freeway on each side of the Los Angeles Central Business District, splitting at the merge of the Harbor Parkway (Harbor Freeway) and Venice Parkway northeast of the University of Southern California, and rejoining at the split between the Arroyo Seco Parkway (Pasadena Freeway) and Riverside Parkway south of Dodger Stadium. Initially known as the East By-Pass and West By-Pass, the latter later became part of the Harbor Parkway, while the former remained as a separate route roughly along Main Street. The state legislature added the East By-Pass to the state highway system in 1947 as Route 222. The Los Angeles City Planning Commission approved a revised master plan in mid-1955, based on various studied that had been made. A new Industrial Freeway replaced the Terminal Island Freeway and Alamitos Parkway between Terminal Island and downtown Los Angeles, where it then continued north along the former East By-Pass (which was not kept south of the Santa Monica Freeway) and the southern part of the Riverside Parkway to the interchange of the Glendale Freeway and Golden State Freeway (which had replaced the rest of the Riverside Parkway). The Industrial Freeway south of the Santa Monica Freeway became Route 270 in 1959,