Bollards can help secure high-profile office buildings.(SECURITY: Protective Design & Construction)

The tragic events of 9/11 left many high-profile corporations feeling increasingly vulnerable to attack and seeking an added level of security. Internal measures--such as the addition of security personnel and the demand for identification of those entering the building--were put in place almost immediately.

Safeguarding a building from the outside was a more difficult matter. For some organizations, including the New York Stock Exchange and several major banks, security bollards provided part of the solution.

Security bollards are posts that are anchored in…