Tshem tawm Bollard

Cov bollards tshem tau yog ib hom khoom siv tsheb uas siv los tswj kev txav ntawm cov tsheb thiab cov neeg taug kev. Lawv feem ntau tau nruab rau ntawm qhov nkag ntawm txoj kev lossis txoj kev taug kev txwv tsis pub cov tsheb nkag mus rau thaj chaw tshwj xeeb lossis txoj kev.
Cov bollards no yog tsim los kom yooj yim ntsia lossis tshem tawm raws li qhov xav tau, tso cai rau kev tswj xyuas tsheb khiav yooj yim.