Kev tiv thaiv hluav taws.
Lub qhov rooj hluav taws yog hais txog lub qhov rooj uas tuaj yeem ua tau raws li qhov yuav tsum muaj ntawm kev tiv thaiv hluav taws xob ruaj khov, kev muaj zog thiab rwb thaiv tsev kub hauv lub sijhawm. Nws yog qhov cub hluav taws nrog qee qhov kev ntsuas hluav taws kub tiv thaiv hluav taws kub, xws li Dao nyob hauv cov hluav taws kub, kev khiav tawm ntawm cov stairwells, thiab cov shat Shafts.
Ntxiv rau txoj haujlwm ntawm cov qhov rooj dog dig, cov qhov rooj hluav taws muaj ua haujlwm tiv thaiv kev sib kis hluav taws thiab ua kom cov neeg khiav tawm ntawm cov neeg.
