Isibani sebhuleki esiphezulu ngokuvamile sifakwa engxenyeni engenhla yangemuva yemoto, ukuze imoto eshayela ngemuva kube lula ukuyibona ingaphambili lebhuleki yemoto, ukuvimbela ingozi yangemuva. Ngoba imoto evamile kakade inezibani ezimbili zebhuleki ezifakwe ngemuva kwemoto, enye kwesobunxele nenye kwesokudla.
Ngakho-ke isibani sebhuleki eliphezulu sibizwa nangokuthi isibani sebhuleki sesithathu, isibani sebhuleki esiphezulu, isibani sebhuleki sesithathu. Isibani sebhuleki esiphezulu sisetshenziselwa ukuxwayisa imoto engemuva, ukuze kugwenywe ukushayisana kwemoto ngemuva.
Izimoto ezingenazo izibani zamabhuleki aphezulu, ikakhulukazi izimoto ezincane ezine-chassis ephansi lapho zibhuleka ngenxa yesikhundla esiphansi sesibani samabhuleki angemuva, ngokuvamile azikhanyi ngokwanele, lezi zimoto ezilandelayo, ikakhulukazi abashayeli bamaloli, amabhasi namabhasi ane-chassis ephezulu ngezinye izikhathi kunzima ukuzibona kahle. Ngakho-ke, ingozi efihliwe yokushayisana kwangemuva inkulu kakhulu. [1]
Imiphumela eminingi yocwaningo ikhombisa ukuthi ukukhanya kwebhuleki eliphezulu kungavimbela futhi kunciphise ngempumelelo ukushayisana kwangemuva. Ngakho-ke, izibani zebhuleki eliphezulu zisetshenziswa kabanzi emazweni amaningi athuthukile. Isibonelo, e-United States, ngokwemithetho, zonke izimoto ezisanda kuthengiswa kumele zibe nezibani zebhuleki eliphezulu kusukela ngo-1986. Wonke amaloli amancane athengisiwe kusukela ngo-1994 kumele abe nezibani zebhuleki eliphezulu.
