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Abstract:Capacity of a freeway is dependent upon physical factors of the roadway, traffic factors, and environmental factors. The effect on capacity of physical and traffic factors has been extensively investigated. However, little study has been devoted to the effect on capacity of environmental factors. This investigation determined the effect of rain, one of the most common environmental disturbances, on freeway capacity. Rainfall records and extensive traffic flow data of the Gulf Freeway Surveillance and Control Center were used to define the effect of rain on capacity. Rain was found to reduce freeway capacity to between 81% and 86% of dry weather capacity with.95% confidence.
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