Cone deg cov ntaub ntawv ntawm cov ntaub ntawv yog: reflective ntawv ci, PVC reflective cone tes tsho, reflective hmoov, cov neeg tuaj yeem xaiv tau raws li tej lub sijhawm.
Kev siv dav dav, txoj kev sib tshuam, kev tsim kev kub ntxhov, chaw ua si, chaw ua si thiab cov chaw so, zej zog thiab lwm qhov chaw, yog kev sib tshuam, .