DocumentCode :
2247740
Title :
Observed time-headway distribution and its implication on traffic phases
Author :
He, Shuyan ; Guan, Wei ; Ma, Jihui
Author_Institution :
MOE Key Lab. for Urban Transp. Complex Syst. Theor. & Technol., Beijing Jiaotong Univ., Beijing, China
fYear :
2009
fDate :
4-7 Oct. 2009
Firstpage :
1
Lastpage :
6
Abstract :
Time-headway between two subsequent vehicles in traffic flow is determined both by traffic dynamics and individual fluctuations, showing a complex behavior. Analyzing real traffic data from multiple sections of urban freeway, we show that the time-headway distributions under different velocities are fitted well with a class of distributions which can be decomposed into an exponential distributed variable plus an independent Gaussian fluctuation, where the exponential component can describe traffic states in a statistical meaning and the random fluctuation is caused by complex traffic dynamics which relates to imperfect individual driving behavior. Based on analyzing the empirical time-headway distribution, traffic flow is recognized as different phases which were observed at urban freeway previously. Moreover, high-velocity highway flow and low-velocity urban freeway flow can be described in a unified framework by shifting distribution parameters.
Keywords :
Gaussian processes; traffic engineering computing; high-velocity highway flow; imperfect individual driving behavior; independent Gaussian fluctuation; low-velocity urban freeway flow; time-headway distribution; traffic data analysis; traffic dynamics; traffic flow; traffic phases; urban freeway; Electric breakdown; Fluctuations; Helium; Independent component analysis; Intelligent transportation systems; Intelligent vehicles; Road transportation; Telecommunication traffic; Traffic control; Vehicle dynamics;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Intelligent Transportation Systems, 2009. ITSC '09. 12th International IEEE Conference on
Conference_Location :
St. Louis, MO
Print_ISBN :
978-1-4244-5519-5
Electronic_ISBN :
978-1-4244-5520-1
Type :
conf
DOI :
10.1109/ITSC.2009.5309540
Filename :
5309540
Link To Document :
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