Two-strokes are out in parks
From ANIMAL PEOPLE, June 2000:
WASHINGTON D.C.– – Recognizing that the most invasive of all species are humans on vehicles with noisy exhaust-spewing two-stroke engines, the National Park Service on April 28, 2000 banned recreational use of snowmobiles at 29 National Parks, National Monuments, and National Recreation Areas.
The ban will be implemented by enforcing existing prohibitions on off-road vehicle use, adopted in 1972, and other disruptive vehicular activity, adopted in 1977.
Exempted from the Park Service edict are only Voyageurs National Park in Minnesota and 11 sites in Alaska, including Denali National Park, where specific legislation permits snowmobiling.