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Snocross
Snocross (also snowcross) is a racing sport involving racing specialized high performance snowmobiles on natural or artificially-made tracks consisting of tight turns, banked corners, steep jumps and obstacles. Riders race at speed of up to 60 miles per hour (96 kilometers per hour).〔(2007 Rock Maple Snocross Racing ), January 26, 2007, Retrieved December 4, 2007〕 Jumps are up to 30 feet (9 meters) tall, so riders travel up to 130 feet (40 meters) before they touch the ground.〔 According to the World Snowmobile Association which governs snocross, watercross, and hillcross racing, snocross is the most popular form of snowmobile racing.〔(Skowhegan will play host to large snocross event ); Portland Press Herald, February 6, 2004; Deirdre Fleming, Retrieved December 5, 2007〕
Snocross was derived from the sport of motocross. The name is a portmanteau of the words "snowmobile" and "motocross". The sport uses a snowmobile instead of a motorcycle, and a snow/ice surface instead of dirt. The snow/ice surface which is either natural or man-made.〔(WPSA SnoCross Duluth Results ), November 27, 2007; Jeffrey Banks, Off-Road.com, Retrieved December 4, 2007〕 Tracks are generally located in higher latitudes in the Northern Hemisphere since temperatures below freezing are required to maintain the frozen track surface. Motorcycle riders in motocross and supercross frequently compete in snocross in the winter.〔
Snocross became an event at the X Games in 1998.〔(The Best North American Snowmobile Competitions ); snowmobilingweb, June 4, 2007; Retrieved December 5, 2007〕 X Games is a popular gathering place for some snow-related sports in the United States. The course at the first snocross event at the X Games resembled a motocross course; it was significantly longer than courses are now. It had deeper holes and higher jumps that are now filled in with snow.〔
== Equipment ==
The snowmobiles vary significantly depending on their class. Sanctioning bodies are governed by International Snowmobile Racing (ISR) rules. Drivers are required to wear a helmet with a minimum of 50% International (Blaze) Orange. (Rule of thumb, a credit card placed anywhere on the helmet must contact orange), racing suit (must have a minimum of 144 square inches of orange on front and back), gloves, goggles/eye protection, leather boots, shin guards, elbow pads, neck braces, knee guards, and upper body protection (Motocross vests are NOT legal for Snocross. Hearing protection is often required in non-stock classes.〔(【引用サイトリンク】title=Mountain West Racing 2008 Snocross rules ) 〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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