Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/23910
Title: Modeling the effects of rainfall intensity on traffic speed, flow, and density relationships for urban roads
Authors: Lam, WHK 
Tam, ML
Cao, X
Li, X
Keywords: Rainfall intensity effect
Speed-flow-density relationships
Issue Date: 2013
Publisher: American Society of Civil Engineers
Source: Journal of transportation engineering, 2013, v. 139, no. 7, p. 758-770 How to cite?
Journal: Journal of transportation engineering 
Abstract: The relationships between traffic speed, flow, and density under various rainfall conditions on urban roads in Hong Kong are investigated in this study. The effects of rainfall intensities are examined empirically, particularly their effects on the reduction of key traffic stream parameters such as free-flow speed, speed at capacity, and capacity (or maximum flow) on urban roads. Rainfall intensity has been found to have significant impacts on urban road key traffic stream parameters, but not on traffic jam density. Generalized speed-flow and speed-density functions are also proposed and calibrated, taking into account the effects of varied rainfall intensity. The calibrated generalized functions are validated with an independent data set from the same location. The generalized speed-flow and speed-density functions are useful for assessing the performance of urban roads, particularly in cites with relatively high annual rainfall intensity. It is believed that the findings could provide better insights into the effects of rainfall intensity on urban road traffic environments for modeling their impacts on road users' route choice behaviors.
URI: http://hdl.handle.net/10397/23910
ISSN: 0733-947X
EISSN: 1943-5436
DOI: 10.1061/(ASCE)TE.1943-5436.0000544
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