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Sounds associated with oversnow vehicles, such as snowmobiles and
snowcoaches, are an important management concern at Yellowstone and
Grand Teton National Parks. The John A. Volpe National
Transportation Systems Center's Environmental Measurement and
Modeling Division is supporting the National Park Service with its
on-going Winter Use Planning program. As part of this support,
acoustic measurements of ten snowcoaches and six snowmobiles were
made at the south entrance to Yellowstone National Park from the
26th through the 28th of February 2008. Measurement methodologies
were guided by SAE J1161 and SAE J192. There were two primary
objectives: 1) to determine which snowcoaches had the Best
Available Technology (BAT) with respect to noise emissions, and 2)
to determine if there was a significant difference between
snowmobile sound levels when tested using two revisions of SAE
J192.
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