Macroscopic Speed-Flow Models for Characterization of Freeway and Managed Lanes
Tomme: LVII (LXI) Fascicle: 1 | 2011
Pages: 149-160
Abstract text:
As part of an effort to estimate operating speeds on freeway managed lanes as a function of predicted demands, speed-density models were calibrated using data at a freeway site. Nine different speed-density models, including four conventional models (Greenshields, Greenberg, Underwood, and Drake) as well as five modifications of these models were calibrated. The conventional Drake model proved to be the best fit model with reasonable estimates of free flow speed and speed and density at capacity for freeway conditions, followed by a Taylor Series expansion version of the Underwood model.
Key Words:
traffic flow models; freeway managed lanes; speed density; macroscopic freeway models.
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