Bollard yotsutsana ndi kuwonongeka

Mabolidi oletsa ngozi ndi mabolidi opangidwa mwapadera omwe amagwiritsidwa ntchito kuyamwa ndi kupirira mphamvu ya kugunda kwa magalimoto, kuteteza zomangamanga, nyumba, oyenda pansi, ndi zinthu zina zofunika kwambiri ku ngozi kapena ngozi zadala.
Mabodi amenewa nthawi zambiri amalimbikitsidwa ndi zinthu zolemera monga chitsulo ndipo amapangidwa kuti apirire kugundana kwakukulu, zomwe zimapereka chitetezo chowonjezereka m'malo ovuta.