Iyo bumper ine mabasa ekuchengetedza kuchengetedza, kushongedza mota uye kugadzirisa aerodynamic hunhu hwemotokari. Panyaya yekuchengeteka, mota inogona kuita basa rebuffer kana yaita tsaona yakaderera-yekudhumhana uye kudzivirira kumberi nekumashure kwemuviri; Inogona kudzivirira vanofamba netsoka kana paita tsaona nevanofamba netsoka. Maererano nechitarisiko, inoshongedza uye yava chikamu chinokosha chekushongedza kuonekwa kwemotokari; Panguva imwecheteyo, bumper yemotokari inewo imwe aerodynamic effect.
Panguva imwecheteyo, kuti kuderedze kukuvadzwa kwevafambi kana pakaitika tsaona yeparutivi, bhampa regonhi rinowanzoiswa pamotokari kuti riwedzere simba rekudzivirira-kurovera kwegonhi. Iyi nzira inoshanda uye iri nyore, ine shanduko shoma kune chimiro chemuviri, uye yakashandiswa zvakanyanya. Kare paShenzhen International Automobile Exhibition ya1993, Honda Accord yakavhura chikamu chemusuwo kuti ibudise pachena bumper yemusuwo kune vateereri kuratidza kushanda kwayo kwakanaka kwekuchengetedza.
Kuiswa kwegonhi bhampa ndeyekuisa akati wandei-akasimba simbi matanda akatwasuka kana oblique mugonhi remusuwo wega wega, iro rinoita basa rekumberi nekumashure bumper, zvekuti mota yese "inoperekedzwa" nemabhampa kumberi, kumashure, kuruboshwe uye kurudyi, kuumba "rusvingo rwemhangura uye rusvingo rwesimbi", kuitira kuti vatasvi vemotokari vave nepamusoro pekuchengetedza nzvimbo. Ehe, kuisa rudzi urwu rwegonhi bumper pasina mubvunzo kuchawedzera mamwe mari kune vanogadzira mota, asi kune vanofamba nemotokari, chengetedzo uye pfungwa yekuchengeteka ichawedzera zvakanyanya.
