Amakamyo afite inshingano zo kurinda umutekano w'imodoka, kuyishariza, no kunoza imiterere y'ikirere cy'imodoka. Mu rwego rw'umutekano, iyo habaye impanuka y'umuvuduko muto, imodoka ishobora kugira uruhare mu kurinda imiterere y'imodoka y'imbere n'iy'inyuma; ishobora kugira uruhare runaka mu kurinda abanyamaguru mu gihe habaye impanuka ku banyamaguru. Mu bijyanye n'isura, ni imitako kandi yabaye igice cy'ingenzi mu gushariza imiterere y'imodoka; muri icyo gihe, akantu k'imodoka gafite ingaruka ku kirere.
Muri icyo gihe, kugira ngo bigabanye imvune ku bari mu modoka mu gihe habaye impanuka ku ruhande, ubusanzwe hashyirwaho bumper y'umuryango ku modoka kugira ngo yongere imbaraga zo kurwanya impanuka z'urugi rw'imodoka. Ubu buryo ni ingirakamaro, bworoshye, kandi bufite impinduka nke ku miterere y'umubiri, kandi bwakoreshejwe cyane. Gushyira bumper y'umuryango ni ugushyira imiyoboro myinshi y'icyuma ikomeye cyane mu buryo butambitse cyangwa butoboye mu gice cy'urugi cya buri rugi, ibi bikaba ari nk'ibice by'imbere n'inyuma by'imodoka, ku buryo imodoka yose ifite bumper "zirinda" impande z'imbere, inyuma, ibumoso, n'iburyo by'imodoka, zigakora "urukuta rw'umuringa", kugira ngo abari mu modoka babe bafite ahantu hatekanye cyane. Birumvikana ko gushyiraho ubu bwoko bwa bumper y'umuryango nta gushidikanya ko byongera ikiguzi ku bakora imodoka, ariko ku bari mu modoka, umutekano n'umutekano bizarushaho kwiyongera cyane.