Ama-bollard asuswayo afakwe phezu komhlaba ayisisombululo sokuphepha esiguquguqukayo esenzelwe ukuhlinzeka kokubili ukulawula ukufinyelela kanye nokuvikelwa. Lawa ma-bollard afakwe ngokuphephile phezu komhlaba, okuvumela ukuthi asuswe kalula noma aphinde afakwe kabusha uma kudingeka. Anikeza ibhalansi yokuphepha kanye nokulula, okwenza afaneleke ezindaweni ezidinga ukufinyelela okulawulwayo kanye nokususwa kwezimoto ngezikhathi ezithile.
