Cov bollards ruaj ntseg puag ncig yog tsim tshwj xeeb los muab cov teeb meem lub cev nyob ib puag ncig ntawm ib lub tsev lossis chaw kom tiv thaiv kev nkag mus tsis raug cai, tiv thaiv kev tawm tsam los ntawm tsheb, thiab txhim kho kev ruaj ntseg ntawm qhov chaw. Cov bollards no yog qhov tseem ceeb rau kev tsim kom muaj kev tiv thaiv zoo tiv thaiv kev hem thawj xws li kev tawm tsam los ntawm kev sib tsoo, kev ua phem, thiab kev nkag mus los ntawm tsheb.
