Abstract
A model for traffic flow in street networks or material flows in supply networks is presented, that takes into account the conservation of cars or materials and other significant features of traffic flows such as jam formation, spillovers, and load-dependent transportation times. Furthermore, conflicts or coordination problems of intersecting or merging flows are considered as well. Making assumptions regarding the permeability of the intersection as a function of the conflicting flows and the queue lengths, we find self-organized oscillations in the flows similar to the operation of traffic lights.
First published in: Networks and Heterogeneous Media 2(2), 193Ú–210 (2007), ©aimSciences.org, reproduction with kind permission.
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Notes
- 1.
The arrival flow A j (t) has previously been denoted by \({Q}_{j}^{\mathrm{arr}}(t)\), the potential arrival flow \(\widehat{{A}}_{j}(t)\) by \({Q}_{j}^{\mathrm{arr,pot}}(t)\), the departure flow O j (t) by \({Q}_{j}^{\mathrm{dep}}(t)\) and the potential departure flow \(\widehat{{O}}_{j}(t)\) by \({Q}_{j}^{\mathrm{dep,pot}}(t)\).
- 2.
Of course, a first-come-first-serve or right-before-left rule will be sufficient at small traffic volumes.
- 3.
If ΔT 1 and ΔT 2 denote the green time periods for the intersecting flows 1 and 2, respectively, the corresponding red time periods for a periodic signal control are ΔT 2 and ΔT 1, to which the switching setup time of duration τ must be added. From formula (23) and with \({O}_{i} =\widehat{ Q}\) we obtain \(\Delta {T}_{1} = (\Delta {T}_{2} + \tau )\widehat{Q}/(\widehat{Q} - {A}_{1})\) and \(\Delta {T}_{2} = (\Delta {T}_{1} + \tau )\widehat{Q}/(\widehat{Q} - {A}_{2})\). Using the definition \({T}^{\mathrm{cyc}} = \Delta {T}_{1} + \tau + \Delta {T}_{2} + \tau \) for the cycle time, we finally arrive at (66).
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Acknowledgements
The authors are grateful for partial financial support by the German Research Foundation (research projects He 2789/5-1, 8-1) and by the “Cooperative Center for Communication Networks Data Analysis”, a NAP project sponsored by the Hungarian National Office of Research and Technology under grant No. KCKHA005.
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Helbing, D., Siegmeier, J., Lämmer, S. (2013). Self-Organized Network Flows. In: Modelling and Optimisation of Flows on Networks. Lecture Notes in Mathematics(), vol 2062. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-32160-3_6
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