BOLLARD

Cov ncej hlau yog cov ncej ncaj nraim uas tau teeb tsa rau hauv thaj chaw xws li txoj kev thiab txoj kev taug kev kom tswj tau kev nkag mus rau hauv tsheb thiab tiv thaiv cov neeg taug kev. Ua los ntawm cov ntaub ntawv xws li hlau tsis xeb, hlau carbon, lossis yas, lawv muaj kev ruaj khov zoo thiab tiv taus kev sib tsoo.

Cov bollards tsheb muaj ntau hom ruaj khov, tshem tau, muab tais tau, thiab nqa tau yam tsis tas siv neeg. Cov bollards ruaj khov yog rau kev siv mus sij hawm ntev, thaum cov uas tshem tau thiab muab tais tau tso cai nkag mus ib ntus. Cov bollards nqa tau yam tsis tas siv neeg feem ntau siv rau hauv cov tshuab tsheb ntse rau kev tswj hwm tsheb yooj yim.