【摘 要】
：
The regular weather-responsive design of variable speed limit (VSL, as a subsystem of Intelligent Transport System) of freeway relys on expensive realtime detection of road surface friction coefficien
【机 构】
：
Traffic Management Research Institute of Ministry of Public Security, Wuxi City, China
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The regular weather-responsive design of variable speed limit (VSL, as a subsystem of Intelligent Transport System) of freeway relys on expensive realtime detection of road surface friction coefficient, not available for economy-underdeveloped regions.A low-cost approach is proposed to design 2 types of weather-responsive VSL (straight-running VSL subject to visible distance, and curve-running VSL aimed at skid-avoidance) in the absence of friction coefficient, using equivalently-approximated discrete friction coefficient (thresholds) depending on the types and intensities of adverse weather elements (i.e.the road surface conditions of dry or wet, further of water or snow/ice covering adhered on road surface), in stead of expensive realtime-detected continuous friction coefficient.
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