Roadblock
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A roadblock is a temporary installation set up to control or block traffic along a road. The reasons for one could be:
- Road construction
- Road closing of some kind
- Detours
- Police chase
- Robbery
In peaceful circumstances, they are usually instantiated 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.