Sight distance means the distance from which you can see and identify a hazard. 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 and Distance
Reaction time is the time it takes you to react to a hazard. It involves these steps:
Recognizing it’s a hazard
Deciding whether to brake or steer around the object
Reaction distance is the distance the ATV 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.).
Normal Reaction Time
Studies reflect that a person’s reaction time is anywhere from one to three seconds. In general, however, three seconds is probably more accurate.