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- W765183861 abstract "Some vertical alignment sags on Japan's motorways are observed to become capacity bottlenecks. The capacity values at these bottlenecks have been reported to be substantially lower than the values at normal highway sections. Observed facts suggest that the bottleneck phenomena are dependent on human factors, such as drivers' ability to perceive gradient change. At the last congress, the author presented a hypothesis that the delay in the human recognition of vertical alignment sags would induce bottleneck phenomena. If the alignment of a sag should be too mild for human perception, drivers would be unable to fully compensate the change of vertical gradient by their appropriate operation of gas pedals, and would drive as they do on level sections. Behavior of vehicles at a bottleneck sag is modeled and simulated, which confirms that human perception should be related to the capacity loss. ITS technologies should have possibilities to assist the limited ability on perception and operation by human drivers. This paper studies the drivers' perception of vertical alignment by experiments. A video recorded from the front seat is shown to subjects. Analyses are given to the perception ability of vertical gradient and environmental elements for drivers: combination of vertical and horizontal alignment, sight distance, and level of traffic volume, considering the lighting atmosphere at day time and night time." @default.
- W765183861 created "2016-06-24" @default.
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- W765183861 date "1996-01-01" @default.
- W765183861 modified "2023-09-26" @default.
- W765183861 title "PERCEPTION ABILITY OF VERTICAL ROAD ALIGNMENT BY DRIVERS" @default.
- W765183861 hasPublicationYear "1996" @default.
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