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relatively rapid growth and planned future development in <br />Orange County also contributes directly to such <br />need. Three such corridors (Foothill, Eastern and San <br />Joaquin Hills) are included on the Master Plan of <br />Arterial Highways (MPAH), and are a component of the <br />Transportation Element of the Orange County General Plan_ <br />Transportation corridors are depicted on the MPAH map as <br />either conceptually proposed or established alignments. <br />These facilities are part of a planned traffic <br />circulation system necessary to support development of <br />the County in accordance with existing General Plan Land <br />Use Elements of the County and City Parties. These <br />facilities will also relieve recurrent congestion on <br />major arterials and freeways in Orange County. <br />The SAN JOAQUIN HILLS TRANSPORTATION CORRIDOR is planned <br />as a high- speed, high capacity, access- controlled <br />transportation facility to serve local and regional <br />traffic and transit needs. Its alignment was <br />established in 1979 as part of the MPAH and <br />Transportation Element of the Orange County General <br />Plan. That alignment includes the Corona del Mar <br />Freeway (Route 73) in the Cities of Costa Mesa, Newport <br />Beach and Irvine and extends southeasterly approximately <br />15 miles to join the San Diego Freeway (I -5) between <br />Avery Parkway and Junipero Serra Road near the City of <br />San Juan Capistrano (see Exhibit I). It will be designed <br />to comport with scenic highway standards and provide <br />approximately six to ten general purpose travel lanes, <br />with a median of sufficient width to accommodate future <br />high - occupancy vehicle (HOV) lanes and special transit <br />facilities, if required in the future. The central <br />segment of the corridor will carry the greatest amount <br />of traffic because there are a limited number of <br />alternative parallel highway facilities. Traffic <br />volumes on the south end of the corridor are lowest along <br />the route as a result of countywide traffic orientation, <br />which is generally to the north. Access to the corridor <br />will be limited to <br />