In February 2008, the Volpe Center performed acoustic measurements of ten snowcoaches and six snowmobiles. These measurements were made with two primary objectives: (1) help determine what testing protocols should be used to determine if snowcoaches meet the sound level BAT and; (2) determine which snowcoaches currently operating in the parks meet the sound level BAT standards. The Volpe Study resulted in a number of recommended improvements to the procedures in SAE J116114.