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In page Interstate 205 (California):

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I-205 is part of the California Freeway and Expressway System,[4] and is part of the National Highway System,[5] a network of highways that are considered essential to the country's economy, defense, and mobility by the Federal Highway Administration.[6] It is officially designated as the Robert T. Monagan Freeway after the California legislator who represented the area from 1961 to 1973.[7]