What is "roadblocks"

Usage examples of "roadblocks".

They saw how easily they had been invaded and now they would have to go back to the old time-wasting ID system, and all the checks: scanners, roadblocks, watchtowers, and aerial patrols.

They had had no trouble with roadblocks or National Guard since they had left Disney World.

We set up roadblocks at every intersection, railroad grade crossing, tollgate, highway exit, and dead-end street.

After the second and third incidents the perpetrator probably left the area before our roadblocks were even set up, since he had six hours the first time and about five hours the next.