Bumper ine basa rekuchengetedza kuchengetedza, kushongedza uye kugadzirisa aerodynamic hunhu hwemotokari. Kubva pakuchengetedzeka kwekuona, mota inogona kuita basa rebuffer pakaitika tsaona yakaderera yekudhumhana, kuchengetedza kumberi uye kumashure kwemota yemotokari; Kana pakaitika tsaona nevanofamba netsoka vanogona kuita chimwe chikamu mukudzivirira vanofamba netsoka. Kubva pakuonekwa, inoshongedza uye inova chikamu chinokosha chekushongedza motokari kuonekwa. Panguva imwecheteyo, mabhampa emotokari anewo imwe aerodynamic effect.
Panguva imwecheteyo, kuitira kuderedza kukuvadzwa kwevari mukati munyaya yetsaona dzeparutivi, motokari dzinowanzogadzirirwa mabhampa emagonhi kuti awedzere simba rekudzivirira-kuroverana kwemagonhi. Iyi nzira inoshanda, iri nyore, shanduko shoma kune chimiro chemuviri, yakashandiswa zvakanyanya. Kare muna 1993 Shenzhen International Automobile Exhibition, gonhi remotokari rakavhurwa kuti ribudise bumper kuti vateereri vaone, kuratidza kushanda kwayo kwakanaka kwekuchengetedza.
Kuiswa kwegonhi regonhi riri mumusuwo wega wega weplate regonhi rakachinjika kana oblique akati wandei akasimba esimbi simbi, tamba basa remota kumberi kwemota kumashure bumper, kuitira kuti mota yese yakatenderedza bumper "protection", ichigadzira "iron wall", kuitira kuti mugari wemotikari ave nenzvimbo yakachengeteka yakanyanya. Zvechokwadi, kuiswa kwemasuo akadaro pasina mubvunzo kuchawedzera mamwe mari kune vanogadzira motokari, asi kune vanogara mumotokari, kuchengeteka uye pfungwa yekuchengeteka ichawedzera zvakanyanya.
