About the Study Guide

You are looking at a preview of what’s in the timed New Hampshire OHRV/Snowmobile Ed Course. Feel free to look around, but you’ll need to register to begin progress toward getting your New Hampshire OHRV/Snowmobile Safety Education Certificate.

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Sight Distance

Sight distance is the distance from which you can see and identify a hazard, not necessarily the total distance you can see. You often see an object before you’re able to identify it as a hazard.

If the stopping distance to an object is greater than the sight distance, you’re in danger of hitting the object.

Reaction Time

Reaction time is the time it takes you to react to a hazard. It involves these steps:

  • Seeing something
  • Recognizing it's a hazard
  • Deciding whether to brake or steer around the object
  • Reacting

Reaction Distance

Reaction distance is the distance the vehicle travels during your reaction time.

  • The distance depends on the reaction time (in seconds) and speed (in feet per second).
  • It is calculated as: Reaction Distance = Reaction Time x Speed

Accidents occur in just a few seconds, so think of your speed in feet per second (multiply mph by 1.46667).

  • 15 mph = 22 ft. per second
  • 30 mph = 44 ft. per second
  • 45 mph = 66 ft. per second
  • 60 mph = 88 ft. per second

At 30 mph with a reaction time of three seconds, the reaction distance is 132 feet (3 sec. x 44 ft./sec.).