The Newhall Pass interchange , where I-5 , Sierra Highway , Foothill Boulevard , San Fernando Road and the southern terminus of SR 14 meet , has been the site of a number of catastrophic incidents . The interchange has partially collapsed twice due to earthquakes : the 1971 Sylmar earthquake and the 1994 Northridge earthquake . As a result of the 1994 collapse , this interchange was renamed the " Clarence Wayne Dean Memorial Interchange " , honoring a Los Angeles Police Department motorcycle officer killed when he was unable to stop in time and drove off the collapsed flyover ramp from SR 14 south to I-5 south . After both earthquakes , the collapsed portions were rebuilt and surviving portions reinforced
1994 Northridge earthquake
1994 Northridge earthquake
California State Route 14