Bollard tiv thaiv kev sib tsoo

Cov bollards tiv thaiv kev sib tsoo yog cov bollards tsim tshwj xeeb uas siv los nqus thiab tiv taus lub zog ntawm kev cuam tshuam los ntawm cov tsheb, tiv thaiv cov khoom siv hauv paus, cov tsev, cov neeg taug kev, thiab lwm yam khoom muaj nqis tseem ceeb los ntawm kev sib tsoo lossis kev sib tsoo txhob txwm.
Cov bollards no feem ntau yog siv cov khoom siv hnyav xws li hlau thiab tau tsim los kom tiv taus kev sib tsoo loj, muab kev ruaj ntseg zoo dua hauv cov chaw rhiab heev.