AN INVESTIGATION INTO THE IMPACT OF RAINFALL ON FREEWAY TRAFFIC FLOW

摘要: Transportation agencies are seeking to integrate weather data into traffic operations in order improve system efficiency. In do so, it is essential that transportation professionals have a solid understanding of the impact various conditions on flow. The purpose this research effort was investigate rainfall, at varying levels intensity, freeway capacity and operating speeds. findings study, derived from collected Hampton Roads region Virginia, add guidance currently available Highway Capacity Manual. summarized below. • Light rain (intensity 0.01 0.25 inches/hour) decreases by 4-10% Heavy inches/hour or greater) 2530%. presence rain, regardless results approximately 5.0-6.5% average decrease These indicate more significant than reported Manual, therefore need carefully examine strategies during rainfall events. Smith, Byrne, Copperman, Hennessy, Goodall 1