Karfe bollars sun zama wani muhimmin abu a cikin tsare-tsaren birane na zamani da matakan tsaro.Waɗannan ƙaƙƙarfan faifai, masu matsayi a tsaye suna aiki da manufa biyu don kare masu tafiya a ƙasa da gine-gine iri ɗaya.Ana amfani da su a wuraren da ake yawan zirga-zirgar ƙafar ƙafa, kamar manyan kantuna, wuraren taruwar jama'a, da hukumomin gwamnati...
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