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1. Keyvan Ekbatani, Mehdi. Real-time urban traffic control under saturated traffic conditions.

Degree: 2013, Technical University of Crete (TUC); Πολυτεχνείο Κρήτης

In recent decades, mitigating the traffic congestion in urban road networks has been a crucial issue for both the research and the practical operations, which calls for the development and implementation of improved traffic signal control methods and techniques. In particular, the development of efficient and practicable real-time signal control strategies under saturated traffic conditions is a major challenge, as widely used strategies like SCOOT and SCATS are deemed less efficient under saturated traffic conditions. A practical tool, frequently employed against over-saturation of significant or sensitive links, arterials or urban network parts, is gating. The idea is to hold traffic back (via prolonged red phases at traffic signals) upstream of the links to be protected from over-saturation, whereby the level or duration of gating may depend on real-time measurements from the protected links. The method is usually employed in an ad hoc way (based on engineering judgment and manual fine-tuning) regarding the specific gating policy and quantitative details, which may lead to insufficient or unnecessarily strong gating actions. Recently, the reproducible relationship between flow and density occurring at the network level under certain conditions (e.g. homogeneous spatial distribution of the congestion) known as macroscopic or network fundamental diagram (MFD or NFD), has gained increased popularity. Although the NFD notion is still under investigation in various aspects, it can be exploited as a fruitful basis for derivation of urban signal control approaches.In this thesis, the notion of NFD for urban networks is exploited to improve mobility in saturated traffic conditions via application of gating measures, based on an appropriatesimple feedback control structure. Different gating control strategies (i.e. single perimeter gating control by exploiting complete and reduced NFD, multiple-concentric gating control, perimeter traffic control via remote feedback gating) have been proposed and tested on realistic simulation scenarios of two urban networks (i.e. Chania, Greece and San Francisco, USA) successfully. In the investigated examples, feedback gating is demonstrated to lead to substantial improvements of travel delays, network throughput and travel time reliability.

Στις τελευταίες δεκαετίες, η ανάγκη μετριασμού της κυκλοφοριακής συμφόρησης στα αστικά οδικά δίκτυα έχει γίνει ένα κρίσιμο θέμα τόσο για την έρευνα όσο και την πρακτική εφαρμογή, το οποίο καλεί για την ανάπτυξη και την εφαρμογή βελτιωμένων μεθόδων και τεχνικών ελέγχου φωτεινής σηματοδότησης. Ειδικότερα, η ανάπτυξη ικανοποιητικών και εφαρμόσιμων στρατηγικών ελέγχου φωτεινής σηματοδότησης σε πραγματικό χρόνο υπό κορεσμένες συνθήκες είναι μια μεγάλη πρόκληση, καθώς ευρέως διαδεδομένες στρατηγικές που χρησιμοποιούνται έως τώρα όπως το SCOOT και το SCATS θεωρούνται λιγότερο αποτελεσματικές υπό κορεσμένες συνθήκες. Ένα πρακτικό εργαλείο, συχνά εφαρμόσιμο κατά του υπερκορεσμού σημαντικών ή ευαίσθητων συνδέσμων, αρτηριών ή περιοχών του αστικού δικτύου,…

Subjects/Keywords: Αστικά οδικά δίκτυα; Χανιά, Κρήτη; Σαν Φρανσίσκο, ΗΠΑ; Ελεγχόμενη είσοδος; Αστική κυκλοφοριακή συμφόρηση; Έλεγχος φωτεινής σηματοδότησης; Θεμελιώδες διάγραμμα του δικτύου (NFD); Αραιά μέτρηση σε πραγματικό χρόνο; Ετερογενή αστικά δίκτυα; Έλεγχος εισόδου πολλαπλών ομόκεντρων; Έλεγχος εισόδου με χρόνους υστέρησης; Operational network fundamental diagram (NFD); Gating; Urban traffic congestion; Signal traffic control; Sparse real-time measurement; Feedback control; Multiple-concentric gating; Heterogeneous urban networks; Time-delayed gating control

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Keyvan Ekbatani, M. (2013). Real-time urban traffic control under saturated traffic conditions. (Thesis). Technical University of Crete (TUC); Πολυτεχνείο Κρήτης. Retrieved from http://hdl.handle.net/10442/hedi/30890

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Keyvan Ekbatani, Mehdi. “Real-time urban traffic control under saturated traffic conditions.” 2013. Thesis, Technical University of Crete (TUC); Πολυτεχνείο Κρήτης. Accessed May 06, 2021. http://hdl.handle.net/10442/hedi/30890.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Keyvan Ekbatani, Mehdi. “Real-time urban traffic control under saturated traffic conditions.” 2013. Web. 06 May 2021.

Vancouver:

Keyvan Ekbatani M. Real-time urban traffic control under saturated traffic conditions. [Internet] [Thesis]. Technical University of Crete (TUC); Πολυτεχνείο Κρήτης; 2013. [cited 2021 May 06]. Available from: http://hdl.handle.net/10442/hedi/30890.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Keyvan Ekbatani M. Real-time urban traffic control under saturated traffic conditions. [Thesis]. Technical University of Crete (TUC); Πολυτεχνείο Κρήτης; 2013. Available from: http://hdl.handle.net/10442/hedi/30890

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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