A physical barrier system for barring entry for a vehicle having a clearance height through a door opening having a roll-up door has a physical barrier positionable in a first position visible to a driver of the vehicle and at least partially barring passage by the vehicle through the door opening, and in a second position not barring passage by the vehicle through the door opening, and a mechanism for moving the physical barrier from the first position to the second position. the system is characterized in that the mechanism for moving the physical barrier is initiated at a to point at which the roll-up door has attained a height equal to or greater. than the clearance height of the vehicle.
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