1. Ua ntej kev saib xyuas, nias ob lub khawm liab nres (sab laug thiab sab xis) los qhia tias lub tshuab tau txais kev saib xyuas.
2. Tsis txhob hla cov guardrails. Mus nce thiab nqis ntaiv maj mam thiab ua tib zoo kom tsis txhob plam thiab ntog.
3. Tsis txhob tshem tawm cov crossbars ntawm cov ntaub woven thiab cia lawv dai ntawm lub gantry thav duab rau hauv av, vim qhov no yuav ua rau lawv dov thiab ua rau cov khoom siv lossis cov neeg ua haujlwm raug mob.
4. Tsis txhob tso cov cuab yeej nyob ib puag ncig kom tiv thaiv kom tsis txhob ntog thiab ntog thaum ua haujlwm, ua rau muaj xwm txheej.
5. Yog tias qhov thaiv kev nyab xeeb yuav tsum tau txav mus rau kev saib xyuas, nws yuav tsum tau rov qab mus rau nws qhov qub tam sim tom qab kev kho tiav.
6. Tom qab kev saib xyuas, khiav lub tshuab ntawm qhov ceev kom tsawg kawg 2 wefts kom paub meej tias kev ua haujlwm ib txwm ua ua ntej mus rau kev kub ceev. Tsuas yog tawm ntawm qhov chaw zov me nyuam tom qab paub meej tias cov ntaub zoo li qub thiab cov cuab yeej siv tau zoo li qub.
