History
I-980 was added to the state highway system in 1947 as part of Legislative Route 226, and to the California Freeway and Expressway System in 1959. This segment of Route 226 became part of State Route 24 in the 1964 renumbering. The Federal Highway Administration approved the addition of the roadway to the Interstate Highway System in January 1976, with Interstate funding only used west of San Pablo Avenue, and the number was legislatively changed to 980 in 1981.
Construction on Interstate 980 began in the 1960s, but was not completed until 1985; officially the freeway was designated as I-980 from its opening. The surface roads which existed prior to the completion of the freeway had been designated as State Route 24.
It is assumed by many that had the San Francisco Bay Southern Crossing ever been built, it would have carried the designation of I-980; this remains purely speculative, however.
Read more about this topic: Interstate 980
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