Thaum xaiv cov guardrails hauv nroog, peb yuav tsum tsom mus rau cov hauv qab no:
1. Muaj nuj nqi: Txawm hais tias lub guardrail ua raws li cov cai hauv zos thiab cov kev cai, thiab muaj kev tiv thaiv thiab kev tiv thaiv kev nyab xeeb;
2. Khoom siv: Xav txog cov khoom siv thiab txheej txheej ntawm cov guardrails hauv nroog, nws muaj kev ruaj khov zoo;
3. Specification: Xaiv qhov siab, dav, thiab tuab kom haum rau cov yam ntxwv ntawm qhov chaw teeb tsa;
4. Tsim: Puas muaj cov qauv tsim kom zoo nkauj thiab zoo nkauj los xyuas kom haum rau cov qauv hauv zos;
5. Kev ntseeg tau: Kev ntseeg tau thiab kev nyab xeeb ntawm cov guardrails kom ruaj ntseg ntawm cov qauv guardrail.