roadblock Synonyms

barricade barrier crossing point no through road checkpoint brick wall access point backstop spot-check logjam encirclement line of defense wall sentry post traffic jam control pin control filter post circulation control office check pin access control point exit control entrance control entry control point barricades barriers stoppage stop restriction dam clog chicane bulwark blockage blockade blocking block barrage barbette defilade fence rampart problem obstruction obstacle moat lock-down impediment hurdle hindrance gatehouse