Richard M. Nixon Parkway
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The Richard M. Nixon Parkway is located in Yorba Linda, California and represents the remnants of a proposed freeway, the Slauson-Marina Freeway. See California State Route 90 for more details.
It was once a signed freeway, identified as California State Route 90 and the Richard M. Nixon Freeway. But in 2002, AB 887 forced the state of California to relinquish control of Route 90 within Yorba Linda's city limits to the city government. Yorba Linda has since improved the roadway and renamed it a parkway, removing all Caltrans signs that referred to it as a freeway.
It is still a de-facto unsigned freeway from the intersection of Yorba Linda Blvd and Imperial Highway (which becomes the parkway) to the intersection with Orangethorpe Avenue/Esperanza Road, where it again becomes Imperial Highway. There are plans to extend the freeway as far as the Riverside Freeway. It passes in the vicinity of the Richard Nixon Library & Birthplace.
Technically, it is an undivided four-lane freeway for about the northern/western two-thirds of its length, and a two-lane freeway for its remaining length.