2.Drive only on established and marked trails or in specified use areas. 

   3.Avoid unknown waterways. Frozen lakes and rivers can be fatal. It is almost impossible to judge
     adequate ice coverage or depth without testing. 

   4.Avoid driving in bad weather. Check warnings for snowy "whiteouts," ice, and wind chill
     conditions before starting. 

   5.Watch the path ahead to avoid rocks, trees, fences (particularly barbed wire), ditches and other
     obstacles. 

   6.Slow at the top of a hill. A cliff, snowbank, or other unforeseen hazard could be on the other
     side. 

   7.Don't hurdle snowbanks. You have control only when your skis are on the ground. 

   8.Learn the snowmobile traffic laws and regulations for the area. Many states prohibit using
     snowmobiles on public roads. Some states have minimum age requirements for drivers. 

   9.Be sensible about stopping at roads or railroad tracks. Signal your turns to other drivers. Avoid
     tailgating. Control speed according to conditions. 

  10.Use extra caution if driving at night, unseen obstacles could be fatal. Do not drive faster than
     you headlights will allow you to see. Do not open new trails after dark. 

  11.Never drink alcohol while driving your snowmobile. Drinking and driving can prove fatal. 

  12.Be sure the snowmobile is properly maintained. Some accident cases report that the throttle
      sticks, leading to loss of control. Snowmobiles manufactured before 1983 may not have a
      "throttle interruption device" (emergency tether) designed to shut off the snowmobile in the event
      the throttle sticks.
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