I-bumper inomsebenzi wokuvikela ukuphepha, ukuhlobisa kanye nokuthuthukisa izici ze-aerodynamic zemoto. Ngokombono wokuphepha, imoto ingadlala indima ye-buffer uma kwenzeka ingozi yesivinini esiphansi, ukuvikela umzimba wemoto wangaphambili nowangemuva; Uma kwenzeka izingozi kubahamba ngezinyawo ingadlala indima ethile ekuvikeleni abahamba ngezinyawo. Ngokubukeka, iyahlobisa futhi iba yingxenye ebalulekile yokubukeka kwemoto yokuhlobisa. Ngesikhathi esifanayo, ama-bumper emoto nawo anomphumela othile we-aerodynamic.
Ngesikhathi esifanayo, ukuze kuncishiswe umonakalo kubantu abagibele uma kwenzeka izingozi zokulimala eceleni, izimoto zivame ukuhlonyiswa ngamabhampa eminyango ukuze kuthuthukiswe amandla okumelana nokushayisana kweminyango. Le ndlela iyasebenza, ilula, ushintsho oluncane esakhiweni somzimba, ibilokhu isetshenziswa kabanzi. Kusukela ngo-1993 eShenzhen International Automobile Exhibition, kwavulwa umnyango wemoto ukuze kuvele i-bamper ukuze izethameli ziyibone, ukuze kuboniswe ukusebenza kwayo okuhle kokuphepha.
Ukufakwa kwebhampa yomnyango kusemnyango ngamunye wepuleti yomnyango ovundlile noma oqondile, okudlala indima yebhampa yangemuva yemoto yangaphambili, ukuze yonke imoto izungeze "ukuvikelwa" kwebhampa, kwakha "udonga lwensimbi", ukuze umuntu ohlala emotweni abe nendawo yokuphepha ephezulu. Yiqiniso, ukufakwa kwamabhampa omnyango anjalo ngokungangabazeki kuzokhulisa ezinye izindleko kubakhiqizi bezimoto, kodwa kubantu abasebenzisa imoto, ukuphepha nomuzwa wokuphepha kuzokhula kakhulu.
