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1-607: A roadblock is a temporary installation set up to control or block traffic along a road. Roadblock may also refer to: Roadblock A roadblock is a temporary installation set up to control or block traffic along a road . The reasons for one could be: In peaceful circumstances, they are usually installed by the police or road transport authorities; they are also commonly employed during wars and are usually staffed by heavily armed soldiers in that case. During protests and riots , both police and demonstrators sometimes use roadblocks. This road-related article