The Challenge of Testing Protecting Vintage US Bridges

More than 600,000 bridges in the U.S are 20 feet long or longer.

Some are over a century old and many of them national monuments. Three government organizations, including the U.S. Army Corp of Engineers, have joined forces to conduct a unique series of tests on bridge scheduled to be demolished. From this, they hope to assess the vulnerability of critical structural components of existing steel bridges.

Source:
http://www.rdmag.com/News/2012/05/Industries-Transportation-Test-Measurement-The-challenge-of-testing-and-protecting-vintage-US-bridges/