Patent ID: 7037031

Claim:
A barricade in a road transverse to a normal traffic direction and intersecting a drainage path at a low water crossing, comprising a trench in the road extending transverse to the traffic direction, a cover spanning the trench and allowing vehicle traffic on the road during dry weather, a series of barricade elements in the trench providing, in an operative position, a physical barrier blocking movement of a vehicle across the trench and, in the operative position, extending at least a plurality of feet above the road and a system for raising the barricade elements from the trench into a position blocking vehicle traffic on the road in the normal traffic direction, the barricade elements being spaced apart in the traffic blocking position so the barricade is permeable to water, the barricade raising system including a first mechanism responsive to rising water adjacent the trench and a second mechanism responsive to the first mechanism for raising the barricade elements significantly above water level.