- Vanhu vanopfuura hafu yenyika, matunhu makumi matatu, vazivisa kuti vachamisazve kuiswa kwehurongwa hwekuchengetedza migwagwa mumigwagwa munyika yese, mushure mekunge vatsoropodzi vati izvi zvaive kuvharira shanduko ine njodzi mukugadzirwa kwekuchengetedza migwagwa kwakakonzera makore anoda kusvika gumi nemaviri apfuura.
Dare redzimhosva rekuTexas rakaona kutanga kwemwedzi uno kuti kambani inogadzira nzira dzekudzivirira migwagwa yeTrinity Industries yakanyengedza hurumende nekuita shanduko muna 2005 isina kuzivisa vakuru vehurumende kana vehurumende nezvekufambisa, uye matunhu mazhinji akazivisa kurambidzwa kwenzira itsva dzekudzivirira migwagwa yeET-Plus. Ipapo Trinity yakarairwa kubhadhara mari inosvika mamiriyoni zana nemakumi manomwe nemashanu emadhora - mari inotarisirwa kuwedzera katatu pasi pemvumo yepamutemo.
Nyika makumi matatu dzakati hadzichaisa sisitimu yeET-Plus, nedzimwe dzichangoburwa dziri Kentucky, Tennessee, Kansas, Georgia nedunhu reTexas rinogara Trinity. Imwe nyika yeVirginia yakati svondo rapfuura iri kushanda pahurongwa hwekubvisa zvidziviriro pamigwagwa mikuru, asi ichafunga nezvekuzvisiya zviripo kana Trinity ikakwanisa kuratidza kuti shanduro dzakagadziriswa dzakachengeteka.
Sisitimu yeET-Plus ndiyo yaive nyaya yekuferefetwa kweABC News "20/20" munaGunyana, iyo yakaongorora zvakataurwa nevanhu vakakuvara mutsaona kuti nzira dzakagadziriswa dzekudzivirira dzaizokanganisa kana mota yarova nemotokari kubva kumberi. Panzvimbo pekutyoka nekupwanya kurova kwacho sezvakarongwa, nzira yekudzivirira "inovhara" uye inopinda nemota zvakananga, mune dzimwe nguva ichicheka makumbo emutyairi.
Sekureva kwe email yemukati yakawanikwa neABC News, mumwe mukuru wekambani akafungidzira kuti shanduko imwe chete - kuderedza chidimbu chesimbi pamucheto weguardrail kubva pamainchi mashanu kusvika pamainchi mana - kwaizochengetedza kambani $2 paguardrail imwe neimwe, kana $50,000 pagore.
Federal Highway Administration yakapa Trinity kusvika Gumiguru 31 kuti ipe hurongwa hwekuyedza kudzivirira njodzi kana kutarisana nehurongwa hwekumisa kutengeswa kwayo munyika yese. Mamwe ematunhu makumi maviri nemasere akati kurambidzwa kweET-Plus kuripo kusvika mhedzisiro yebvunzo dzenjodzi dzawanikwa.
Trinity yagara ichiti maguardrails akachengeteka, ichiti FHWA yakabvumidza kushandiswa kweguardrails dzakagadziriswazve muna 2012 mushure mekubvunza mibvunzo nezvekuchinja uku. Kambani iyi inoronga kukwidza nyaya yemutongo weTexas, mushure mekunge yamboudza ABC News kuti ine "chivimbo chikuru" mukushanda uye kuvimbika kwehurongwa hweET-Plus.