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Since the attacks on Sept. 11, 2001, the United States has been more focused on keeping buildings safe. Use security bollards to better protect people in the doorways of buildings. A bollard is a short vertical post used to herd pedestrian and vehicle traffic, mark parking and protect buildings.
By placing a bollard in front of a door, you put an obstacle in the way. This means a person in that doorway is more safe from the threat of a moving vehicle. A bollard in front of a doorway can also protect the vulnerable windows around that doorway from a side angle attack from a moving vehicle. Safety bollards offer 24-hour protection.
According to Creative Building Products, bollard manufacturers in Indiana, you should never use just one bollard -- use at least two bollards for minimum security.