It is well known that more accurate bridge load ratings can be obtained through live load diagnostic test.However,both the field testing and analysis procedures have usually been considered "research topics" since both can be relatively difficult to complete.Over the last twenty-two years,Bridge Diagnostics,Inc.has developed and refined a technique that makes this process fast,efficient and cost-effective.The specialized wireless Structural Testing System data acquisition equipment and testing methods have been used to test approximately 450 structures around the U.S.,Asia,Australia and Middle East.This paper describes this highly effective approach by outlining the specialized equipment,field testing method and analysis techniques,along with describing some of its advantages and limitations.