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The perceived rate of motion applies to a person as they adapt or are conditioned to an environmental stimulus. In professional motocross, motorcycle road racing, Cart, Indy, Nascar, Trans-Am, for example, the speeds are sensational to visual and physical reaction. In these sports, speeds often reaching 200 miles per hour are visually adjusted to fit the conditions given for each type of event. An illustration of speed adjustment is noted when a motorcycle road racer falls and slides across the pavement. When falling and sliding, the rider slows to a level that feels controllable only to find that he has misjudged the speed. This judgment error results in his body cartwheeling end over end and then coming to a violent stop. People that have been directly involved in a car accident, for example, say the event happened slowly while witnesses claim the accident appeared to have occurred at an incredibly fast rate.

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