01366473

Component

Traffic speed variance is defined as a measure of the dispersion of space mean speeds among drivers. Empirical speed-density observations exhibit a structured traffic speed variance which has been found to be associated to the road accident rate, the fatality rate, and travel time variability. The objective of this paper is to propose a generalized traffic speed variance function to describe this structured variance and identify its potential applications. In nature, the proposed speed variance function is a response of the speed-density curve with two additional parameters. A series of logistic speed-density curve with varying parameters is used in the proposed traffic speed variance function with different performances. This traffic speed variance model will help to unveil the underlying mechanism of some empirical traffic features such as spontaneous congestion or capacity drop.

This paper was sponsored by TRB committee AHB45 Traffic Flow Theory and Characteristics

01362476

12-2618

English

20p

2012

Transportation Research Board 91st Annual Meeting

Digital/other

Figures; References; Tables

Analysis of variance; Parametric analysis; Traffic congestion; Traffic data; Traffic density; Traffic models; Traffic simulation; Traffic speed

Highways; Operations and Traffic Management; I70: Traffic and Transport; I73: Traffic Control

Transportation Research Board Annual Meeting 2012 Paper #12-2618

TRIS, TRB

Feb 8 2012 5:10PM