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Field literature in testing and experimentation on general human perception and reaction times, was reviewed to better address questions on the parameters of driving performance. Brake reaction time studies and driver visual search studies were reviewed with attendant material on the effects of aging, intoxication and fatigue. A short examination is made on the degree of increase in “surprise intrusion” event upper values from simple human basic reaction time testing to a real-time pedestrian crossing event in real-world urban driving. These upper range values began at 0.78 second in the laboratory environment and became 2.50 seconds on an urban street in real-time.