s , ▁which ▁was ▁followed ▁by ▁numerous ▁reports ▁of ▁trag ic ▁acc idents ▁and ▁media ▁expert ▁comment ary . ▁At ▁the ▁time , ▁A udi ▁was ▁reported ▁to ▁have ▁the ▁highest ▁rate ▁of ▁acceleration ▁compla ints . ▁However , ▁the ▁N HT SA ▁later ▁determined ▁all ▁compla ints ▁to ▁be ▁due ▁to ▁driver ▁error . The ▁Detroit ▁News ▁documented ▁previous ▁sudden ▁un int ended ▁acceleration ▁cases ▁d ating ▁back ▁to ▁August ▁ 1 9 7 8 ▁when ▁the ▁N HT SA ▁opened ▁an ▁investigation ▁into ▁General ▁Mot ors ▁for ▁sudden ▁acceleration , ▁con cluding ▁eight ▁years ▁later ▁driver ▁error ▁was ▁the ▁likely ▁cul prit . ▁ ▁By ▁ 1 9 8 6 , ▁more ▁than ▁ 2 , 0 0 0 ▁inj uries ▁had ▁been ▁bl amed ▁on ▁sudden ▁acceleration ▁with ▁sudden ▁acceleration ▁compla ints ▁total ing ▁over ▁ 1 0 ▁percent ▁of ▁compla ints ▁file d ▁to ▁the ▁N HT SA . ▁In ▁ 1 9 8 6 ▁the ▁N HT SA ▁launched ▁an ▁investigation ▁of ▁the ▁ 1 9 8 1 - 8 4 ▁Toy ota ▁C ress ida ▁and ▁an ▁additional ▁five ▁other ▁autom akers . ▁By ▁ 1 9 8 9 ▁the ▁N HT SA ▁determined ▁driver ▁error ▁was ▁" the ▁most ▁probable ▁explanation " ▁for ▁the ▁compla ints . ▁ ▁N HT SA ▁and ▁NASA ▁Investig ation ▁Ver dict ▁In ▁February ▁ 2 0 1 1 , ▁the ▁find ings ▁of ▁a ▁ 1 0 - month - long ▁study ▁conducted ▁by ▁the ▁National ▁Highway ▁Tra ffic ▁Saf