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Reasonable Spacing Model of Chevrons
In order to improve the shortage in calculating principles and methods of chevron spacing, and to increase the dependability for four visible chevrons and the accuracy of road curve radius perception, the authors have concentrated on six basic curves under different design speeds according to the Design Specification for Highway Alignment in China. They have taken into account the five factors including the angle and distance of acute cone vision, scattering angle and distance of the vehicle lamp, chevron legible distance, driver's eye focus location, and deceleration distance when a vehicle approaches the curve at a high speed. The goal is that four chevrons can be seen at the same time at the edge of the median of a dual two-lane highway. The five characteristic points of the basic curves are set as the chevron setting jumping-off point. The model of chevron spacing is established according to the curve's integral characteristics and by the tangent off-set method. Then with the minimum as the reasonable spacing, and based on the reasonable setting space of the basic type of curve under different design speeds, the ultimate chevron spacing model is achieved. In addition, this paper discusses assumptions about problems about curve inducement in multi-lane, and dependability for four visible chevrons at the same time, and so on.
Reasonable Spacing Model of Chevrons
In order to improve the shortage in calculating principles and methods of chevron spacing, and to increase the dependability for four visible chevrons and the accuracy of road curve radius perception, the authors have concentrated on six basic curves under different design speeds according to the Design Specification for Highway Alignment in China. They have taken into account the five factors including the angle and distance of acute cone vision, scattering angle and distance of the vehicle lamp, chevron legible distance, driver's eye focus location, and deceleration distance when a vehicle approaches the curve at a high speed. The goal is that four chevrons can be seen at the same time at the edge of the median of a dual two-lane highway. The five characteristic points of the basic curves are set as the chevron setting jumping-off point. The model of chevron spacing is established according to the curve's integral characteristics and by the tangent off-set method. Then with the minimum as the reasonable spacing, and based on the reasonable setting space of the basic type of curve under different design speeds, the ultimate chevron spacing model is achieved. In addition, this paper discusses assumptions about problems about curve inducement in multi-lane, and dependability for four visible chevrons at the same time, and so on.
Reasonable Spacing Model of Chevrons
Zhu, Shunying (author) / Peng, Wuxiong (author) / Sun, Qinmei (author) / Xu, Yuan (author) / Guan, Juxiang (author) / Dong, Hongli (author)
Seventh International Conference of Chinese Transportation Professionals Congress (ICCTP) ; 2007 ; Shanghai, China
2008-03-21
Conference paper
Electronic Resource
English
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