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On-Board Sound Intensity (OBSI)

On-Board Sound Intensity (OBSI) measurements provide an efficient, standardized way to compare the noise-reduction benefits of different pavement types and also to evaluate changes in tire-pavement noise over time. Because tire-pavement interaction is the primary cause of highway traffic noise, measuring tire-pavement noise at its source is the most direct way to quantify the benefits of quieter pavements. HMMH conducts OBSI measurements in accordance with AASHTO Standard TP 76-09, ensuring repeatable results that may be directly compared to measurements conducted elsewhere or at another time.

Recent HMMH OBSI measurement studies include:

  • Virginia Center for Transportation Innovation and Research and the Department of Transportation: OBSI measurements conducted at 16 sites throughout Virginia;
  • Virginia Center for Transportation Innovation and Research and the Department of Transportation: OBSI tire/pavement noise measurement services for four sites along Route 7 west of Leesburg, Virginia;
  • New Hampshire Department of Transportation, Bureau of Materials and Research: OBSI measurements at two sites along Rt. 38 in Pelham, New Hampshire;
  • Rhode Island Department of Transportation: OBSI tire/pavement noise measurement services along Interstate Route I-195 between I-95 and East Providence, Rhode Island for conditions both prior to and after diamond grinding of the existing concrete bridge deck, roadway, and on/off/interchange-ramp surfaces.

On-Board Sound Intensity (OBSI) measurement

Papers & Presentations