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.
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 .