Tsis Siv Neeg Bollard

Cov bollards tsis siv neeg (tseem hu ua automatic retractable bollard lossis electric bollard lossis hydraulic bollards) yog cov teeb meem kev ruaj ntseg, ib hom kev nqa khoom tsim los tswj kev nkag mus rau hauv tsheb.
Nws yog ua haujlwm los ntawm kev tswj chaw taws teeb lossis xov tooj app lossis khawm nias, tuaj yeem koom ua ke rau qhov chaw nres tsheb, teeb liab, lub tswb hluav taws, kev lees paub daim ntawv tso cai, lub koob yees duab tswj hwm lub tsev.