Amabhampa anemisebenzi yokuvikela ukuphepha, ukuhlobisa imoto, kanye nokuthuthukisa izici ze-aerodynamic zemoto. Ngokombono wokuphepha, lapho kwenzeka ingozi yesivinini esiphansi, imoto ingadlala indima yokuvikela imizimba yemoto yangaphambili neyangemuva; ingadlala indima ethile ekuvikeleni abahamba ngezinyawo uma kwenzeka ingozi kwabahamba ngezinyawo. Ngokubukeka, kuyahlobisa futhi sekuyingxenye ebalulekile yokuhlobisa ukubukeka kwemoto; ngesikhathi esifanayo, i-bumper yemoto nayo inomphumela othile we-aerodynamic.
Ngesikhathi esifanayo, ukuze kuncishiswe ukulimala kwabagibeli bemoto uma kwenzeka ingozi yokushayisana eceleni, kuvame ukufakwa i-bumper yomnyango emotweni ukuze kuthuthukiswe amandla okulwa nokushayisana komnyango wemoto. Le ndlela iyasebenza, ilula, futhi ayinalo ushintsho olukhulu esakhiweni somzimba, futhi isetshenziswe kabanzi. Ukufakwa kwe-bumper yomnyango ukubeka imishayo yensimbi eminingana enamandla aphezulu ngokuvundlile noma ngokugobile ephaneli lomnyango womnyango ngamunye, odlala indima yama-bumper angaphambili nangemuva emoto, ukuze yonke imoto ibe nama-bumper "aqapha" izinhlangothi zangaphambili, zangemuva, zesobunxele, kanye nezokunene zemoto. , okwenza "udonga lwethusi", ukuze abagibeli bemoto babe nendawo yokuphepha ephezulu. Vele, ukufaka lolu hlobo lwe-bumper yomnyango ngokungangabazeki kuzokhulisa ezinye izindleko kubakhiqizi bezimoto, kodwa kubagibeli bemoto, ukuphepha nomuzwa wokuphepha kuzokwanda kakhulu.