125 to I-5. In 1967, the Coronado Bridge was scheduled to be added to the route once it was completed, and the portion from Fourth Street to the ferry was deemed as temporary until the bridge opened. Construction began in February. Coronado residents largely opposed the bridge, but Governor Pat Brown "overrode their wishes" according to former city councilman Bob Odiorne, who also claimed that the opposition caused the city to lose opportunities to move the approaches to the bridge away from residential areas. Following attempts from Barbara Hutchinson, the vice president of the Kearny Mesa Town Council, to ask the Coronado and San Diego city councils to intervene in the construction, San Diego city attorney Edward Butler stated that the state had the ultimate authority to decide whether or not to build the bridge, and that the City of San Diego could not interfere. Before the bridge opened, in 1968, the changes originally proposed by the Legislature in 1967 were made to the law; the designation came into effect on February 21, 1969. The bridge eventually opened on August 3, 1969. By 1969, Palm Avenue was the primary commercial street in Imperial Beach, and was described by the San Diego Union as "a strip of large signs and businesses. It is not a 'downtown.'" Plans were under way to add an interchange at Silver Strand State Beach for the Coronado Cays development. In September, the City of Coronado added Orange Avenue south of Third Street as a truck route leading to the base. By May 1970, the part of SR 75 on the Coronado Bridge had been declared a scenic highway. President Richard Nixon and Mexican president Díaz Ordaz used Orange Avenue as a motorcade route on September 3, 1970, en route to the Hotel del Coronado. Proposals and renumbering Proposition N was proposed in 1974 to attempt to resolve concerns regarding traffic in Coronado. The plan was to build another highway along the northern and eastern shore of Coronado Island, to bypass the busy residential and commercial districts and provide easy access to the Silver Strand from the western end of the bridge. The proposition asked voters whether the City Council should "actively pursue" the matter. Critics contended that the highway would block the view of the San Diego Bay, and that the city would be unable to alter traffic patterns in the meantime. Coronado mayor Rolland McNeely