" . . .the temporary plan requires that all recreational snowmobiles entering the parks meet best available technology (BAT) requirements. This requirement, along with air emissions requirements for snowcoaches, ensures that the vast majority of recreational over-snow vehicles operating in the parks employ current emissions control equipment, and has resulted in improvements in air quality and natural soundscapes."
"Beginning in the 2011-2012 season, all snowcoaches must meet air emission requirements, which will be the functional equivalent of having EPA Tier I emissions control equipment incorporated into the engine and drive train for the vehicle class (size and weight) as a wheeled vehicle."
"Beginning in the 2011-2012 season, snowcoaches must meet a sound emissions requirement of no greater than 73dBA; test procedures to be determined by the NPS."
"No more than eight snowmobiles would be permitted in a group with one commercial guide; no more than 17 snowmobiles would be permitted in a group with two commercial guides on separate snowmobiles. Group numbers include the guide's machine."
"As of the 2008-2009 winter season, the East Entrance road would be closed to through travel by oversnow vehicles in order to address the avalanche risk at Sylvan Pass that cannot be reasonably mitigated. The one-year delay in implementing the change on the East Entrance road is proposed in response to comments received from cooperating agencies who expressed concern for communities and businesses to make appropriate adjustments."
.. See the rule, and comment HERE, (key word=Yellowstone.)
Did You Know?
At peak summer levels, 3,500 employees work for Yellowstone National Park concessionaires and about 800 work for the park. Just who is running Yellowstone National Park?