chapter5 - CE222 Highway Engineering Notes for Chapter 5...

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CE222 Highway Engineering Notes for Chapter 5 Driver, Pedestrian and Vehicle Characteristics Highway System: Road Users Vehicles Road Facilities Road Users consists of Drivers and Pedestrians 1) Driver Characteristics The human sensory process A driver’s senses dealing with vehicle movement are: Sight, movement, equilibrium, and hearing Sight: Sharp vision within a cone with an angle = 3 ° Reasonably sharp within a conical angle up to about 10 ° Vision perceiving peripheral objects: 160 ° Movement: Acceleration and deceleration Equilibrium: balance Hearing: Sound Driver Perception and Reaction (Very important concept) PIEV: Perception, Intellection, Emotion and Volition. ASSHTO uses 2.5 seconds for perception and reaction time. Driver Information Needs: Three levels of information needs: Control level: Physical operation of the vehicle Steering, acceleration and deceleration Guidance level: Selecting a safe speed and path on the roadway Navigation level: Direction In detail, see Table 5-1 How to balance these needs:
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This note was uploaded on 02/09/2009 for the course CE 222 taught by Professor Jia during the Winter '09 term at Cal Poly Pomona.

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chapter5 - CE222 Highway Engineering Notes for Chapter 5...

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