The Japan Highway Public Corporation renewed its traffic simulator machine and took the opportunity to instally the vibration isolation system with air springs which the authors have developed. This report presents a series of results achieved in the process from the design stage to performance verification testing. In the first stage, the response of the surrounding soil surface and the basement of the test facility building were measured before the renewal and the deisgn target level of response reduction was determined. Next, a loading test of the air spring itself was conducted and the design specification was revised. Finally, a performance verification test was conducted on the test facility after the renewal. The test results indicate that at the site border the response of the soil surface to the test machine operation was reduced to the microtremor level.
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