Quav Bollard

Cov bollards uas quav tau yog ib qho kev daws teeb meem uas siv tau thiab yoog tau rau kev tswj kev nkag mus rau hauv tsheb thiab kev tswj chaw nres tsheb.
Cov bollards no tau tsim los kom yooj yim tais thaum xav tau kev nkag mus, thiab tsa rov qab kom txwv tsis pub tsheb nkag mus rau qee thaj chaw. Lawv muaj kev sib xyaw ua ke zoo ntawm kev ruaj ntseg, kev yooj yim, thiab kev txuag chaw.