Driver s eye height

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representative eye height might be 41 or 42 in, if variation among drivers in seated eye heights is considered, SENSITIVITY TO EYE-HEIGHT CHANGES How is visibility over the crest of a hill affected for a driver whose eye height is other than the value assumed in the design of . DRIVER EYE HEIGHT: A FIELD STUDY. This paper presents the results of a survey of driver eye heights with measurements taken when drivers are in their normal driving positions and when they are operating their vehicles under normal conditions. For the evaluation of driver eye height, measurements were made on side view photographs of different passenger cars Cited by: 8. Passing sight distance for passenger cars is measured from a ft ( m) height of eye to a ft ( m) height of object. The ft ( m) height of object allows the opposing driver to see the top of a typical passenger car. The recommended value of truck driver eye height for design is ft ( m) above the roadway surface.

For passenger vehicles, it is assumed that the driver’s eye height is feet and the height of an approaching vehicle is feet above the roadway surface, as illustrated in Figure At the decision point, as shown in Figure , the driver’s eye height is used for measurement. Major Street Minor Street Decision Point Driver Eye Height. Driver eye height – consistency over time The AASHTO green book edition suggests an eye height for car drivers of 1,08m and refers to studies from The edition suggests m and refers to a study from On a given hill crest, sight distance for a driver whose eye height is 6-inches lower than the design eye height ( ft) is only 5% less than the design sight distance. On the other hand, stopping distance is very sensitive to travel speed, pavement friction and reaction time. For example, a mph decrease in speed reduces stopping distance by the same amount that a 6-inch decrease in eye height reduces sight distance.

Height of the object above the road surface. ▻ For the purpose of measuring SSD, IRC has suggested. ▻ The height of eye level of drivers as m . 2) If overtaking sight or intermediate sight distance is considered, then the value of driver's eye height and the height of obstructions are taken equal as. 1 On a given hill crest, sight distance for a driver whose eye height is 6-inches lower than the design eye height ( ft) is only 5% less.