Delta Scientific
Green Line Barriers and Barricades
Delta Scientific offers over fifty hydraulic barrier, barricade, bollard and crash gate designs that can be run manually or on FDA-approved vegetable oils. The units typically remain in the upright position to protect the facility from terrorists and errant drivers. To let authorized vehicles through, they are lowered and then raised once again when the vehicle has passed. Barricades, bollards, gates and beams also feature electromechanical power, pneumatic power and hand operation.
http://www.deltascientific.com/