Ama-bollard okuhlobisa angaphandle aklanyelwe ukuhlinzeka ngokuphepha okusebenzayo kanye nokukhanga kobuhle ezindaweni zomphakathi nezangasese. Lawa ma-bollard awagcini nje ngokuvikela izindawo zabahamba ngezinyawo, alawule ithrafikhi, futhi avikele ingqalasizinda, kodwa futhi athuthukisa ukukhanga okubonakalayo kwemvelo.