Bumper ifite imirimo yo kurinda umutekano, gushushanya ikinyabiziga no kunoza ikirere kiranga ikinyabiziga. Ku bijyanye n’umutekano, irashobora kugira uruhare rwa buffer mugihe habaye impanuka yo kugongana byihuse kandi ikarinda umubiri wimbere ninyuma; Irashobora kurinda abanyamaguru mugihe habaye impanuka nabanyamaguru. Kubireba isura, irashushanya kandi yabaye igice cyingenzi cyo gushushanya isura yimodoka; Mugihe kimwe, bumper yimodoka nayo igira ingaruka runaka yindege.
Muri icyo gihe, mu rwego rwo kugabanya imvune z’abagenzi mu mpanuka zatewe n’impanuka, ubusanzwe inzugi zishyirwa ku modoka kugirango zongere ingaruka zo kurwanya impanuka. Ubu buryo ni ingirakamaro kandi bworoshye, hamwe nimpinduka nke kumiterere yumubiri, kandi yarakoreshejwe cyane. Nko mu imurikagurisha mpuzamahanga ry’imodoka ryabereye mu mujyi wa Shenzhen mu 1993, Honda Accord yafunguye igice cy’umuryango kugira ngo yerekane abateranye urugi kugira ngo berekane imikorere myiza y’umutekano.
