Synonyms of 'roadblock'
A barricade is a line of vehicles or other objects placed across a road or open space to stop people getting past, for example during street fighting or as a protest.
Large areas of the city have been closed off by barricades.
A barrier is something such as a fence or wall that is put in place to prevent people from moving easily from one area to another.
The demonstrators broke through the heavy police barriers.
Thesaurus for roadblock from the Collins English Thesaurus
When the police or the army put a roadblock across a road, they stop all the traffic going through, for example because they are looking for a criminal .