Lecture 7 - The Pennsylvania State University Department of...

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The Pennsylvania State University Department of Civil and Environmental Engineering CE 321: Highway Engineering Lecture 7: Vehicle Braking – Part 2 Fall 2007
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Role in Highway Engineering Braking behavior of vehicles is critical in the determination of: Stopping Sight Distance Roadway Design Elements Ramps Intersections Accident Avoidance Systems
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How do we move from braking to stopping distance? Relate braking forces to stopping and highway design Stopping Sight Distance (SSD) Perception-Reaction (P/R) Time Braking distance
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Perception / Reaction Distance Perception / Reaction time of a driver is a function of: driver’s age physical condition emotional state complexity of the situation the strength of the stimuli requiring a stop
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Perception / Reaction Distance 2 Four distinct actions for a stimulus (e.g. a child running into the street) PIEV Time P = Perception I = Identification E = Emotion or Decision V = Volition or Reaction
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Driver ??
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Lecture 7 - The Pennsylvania State University Department of...

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