"NHTSA" . . "National Highway Traffic Safety Administration#NCAP" . . "National Highway Traffic Safety Association" . "come into effect" . . "its trend over time" . "U.S. Federal Motor Vehicle Safety Standards" . "US safety standards" . . . "1970-12-31" . "U.S. National Highway Traffic Safety Administration" . . "US headlamp regulations were amended" . "composite headlamps" . "National Highway Traffic Safety Administration's" . . "United States" . . . . "8.99E8" . "626" . "Administrator of the National Highway Traffic Safety Administration" . "N.H.T.S.A." . "National Highway Traffic Safety Administration" . "U.S. regulations" . . . . . . . . "National Highway Traffic Safety Administration" . . "National Highway and Traffic Safety Administration's" . . "1970" . "U.S. National Highway Traffic Safety Administration's" . . . "Federal Motor Vehicle Safety Standards" . "US National Highway Traffic Safety Administration (NHTSA)" . . "National_Highway_Traffic_Safety_Administration#NCAP" . "National Highway and Traffic Safety Administration (NHTSA)" . . "NHTSA's" . "American" . . . "National Highway Traffic Safety Administration (NHTSA)" .