Bumper ifite inshingano zo kurinda umutekano, gushariza no kunoza imiterere y'ikirere cy'ikinyabiziga. Mu rwego rw'umutekano, imodoka ishobora kugira uruhare mu kurinda imodoka mu gihe cy'impanuka y'umuvuduko muto, kugira ngo irinde umubiri w'imodoka y'imbere n'iy'inyuma; Mu gihe cy'impanuka ku banyamaguru ishobora kugira uruhare runaka mu kurinda abanyamaguru. Mu buryo igaragara, ni igishushanyo mbonera kandi iba igice cy'ingenzi cy'imiterere y'imodoka. Muri icyo gihe, bumper z'imodoka nazo zifite ingaruka ku kirere.
Muri icyo gihe, kugira ngo bigabanye ingaruka mbi ku bari mu modoka mu gihe habayeho impanuka ku ruhande, imodoka ziba zifite utubati two ku muryango kugira ngo twongere imbaraga zo kurwanya impanuka ku nzugi. Ubu buryo ni ingirakamaro, bworoshye, nta mpinduka nyinshi ku miterere y'umubiri, kandi bwakoreshejwe cyane. Mu imurikagurisha mpuzamahanga ry'imodoka rya Shenzhen ryo mu 1993, umuryango w'imodoka warafunguwe kugira ngo ugaragarize abareba, kugira ngo berekane imikorere myiza y'umutekano.
Gushyiramo bumper y'urugi kuri buri rugi rw'urugi, rukambitse cyangwa ruzungurutse, rugafata umwanya wa bumper y'inyuma y'imodoka, ku buryo imodoka yose ikikije bumper "irindwa", igakora "urukuta rw'icyuma", ku buryo umuntu uri mu modoka agira ahantu hatekanye cyane. Birumvikana ko gushyiraho bumper nk'izo nta gushidikanya ko bizamura ikiguzi kimwe ku bakora imodoka, ariko ku bantu bari mu modoka, umutekano n'umutekano bizarushaho kwiyongera.
