E01F 13/046

Arrangements for obstructing or restricting traffic, e.g. gates, barricades {; Preventing passage of vehicles of selected category or dimensions } movable to allow or prevent passage {the barrier being formed by obstructing members situated on, flush with, or below the traffic surface, e.g. with inflatable members on the surface the obstructing members moving up in a translatory motion, e.g. telescopic barrier posts }