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Establishment and Calibration of Traveled Speed Function for Traffic Network Based on Macroscopic Fundamental Diagram

  • Deyong Guan
  • Lianhua An
  • Huijia Leng
Conference paper
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 503)

Abstract

This paper proposes a three-dimensional generalization of macroscopic fundamental diagram (MFD), which relates average speed to average density and inhomogeneity of density. Considering temporal and spatial characteristics of traffic demand, the paper defines the total number of vehicle kilometers (TVK) instead of traffic flow to depict traffic efficiency of road network, and deduces macroscopic traffic relations of network-wide properties. Traveled speed function is established and calibrated by the statistical method and theoretical deduction. Function parameters are estimated by Levenberg–Marquardt algorithm. In diagrams, the change path on time series of traveled demand is shown as a single peak mostly and bimodal seldom with a single peak of density. Both vary consistently if in a good traffic state, otherwise, traffic jam will happen at bimodal points and time window before the traveled peak. Given a traffic network, the average speed is an exponential function of average density and spatial spread of density. A dataset of Qingdao city in Chinese is applied to calibrate parameters of traveled speed function and made an analysis of estimation error. It proves this method is reasonable.

Keywords

Macroscopic fundamental diagram Traveled speed function Total number of vehicle kilometers Traffic efficiency 

Notes

Acknowledgements

This research was funded by Scientific Research Foundation of Shandong University of Science and Technology for Recruited Talents (NO. 2015RCJJ032), and SDUST Innovation Fund for Graduate Students (No. SDKDYC170367).

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Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  1. 1.Transportation CollegeShandong University of Science and TechnologyQingdaoChina

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