Based on Shanghai elevated road traffic flow, six kinds of speed-density models are calibrated by least square method for clear and rainy weather and the respective best models to estimate free-flow speed and capacity are determined. Next, the function between free-flow speed and rainfall intensity is also fitted and it is integrated into generalized speed-density models. It is found that both weather and number of lanes influence free-flow speed and capacity, and generalized speed-density models also vary with different combination of weather and number of lanes.
Generalized Speed-Density Models for Urban Freeways under Rainy Weather
Fifth International Conference on Transportation Engineering ; 2015 ; Dailan, China
ICTE 2015 ; 1728-1737
2015-09-25
Conference paper
Electronic Resource
English
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