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Understanding Traffic Capacity of Urban Networks

Figure 1. Traffic in urban road networks. (a) Shows the layers of urban transportation networks. The city with all streets forms the basis, where a major road network takes over the connecting functions and then the public transport system. Background map is courtesy of OpenStreetMap. (b) Time series of a single detector on a street in Zurich, and (c) the corresponding scatter plot of detector occupancy versus flow. When aggregating al measurements in the purple area in (a), smooth curves in the flow-density domain (d), and in the speed density domain (e) emerge.

Allister Loder, Lukas Ambühl, Monica Menendez, Kay W. Axhausen
2019

Traffic in an urban network becomes congested once there is a critical number of vehicles in the network. To improve traffic operations, develop new congestion mitigation strategies, and reduce negative traffic externalities, understanding the basic laws governing the network’s critical number of vehicles and the network’s traffic capacity is necessary.

However, until now, a holistic understanding of this critical point and an empirical quantification of its driving factors has been missing. Here we show with billions of vehicle observations from more than 40 cities, how road and bus network topology explains around 90% of the empirically observed critical point variation, making it therefore predictable. Importantly, we find a sublinear relationship between network size and critical accumulation emphasizing decreasing marginal returns of infrastructure investment. As transportation networks are the lifeline of our cities, our findings have profound implications on how to build and operate our cities more efficiently.

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This article has been published in the following newsletter edition:

44 | Dezember 2019: Methoden / Methods

  • Collective Actors and the Production of the City: Urban Commons in Research
  • Backcasting – vom Übermorgen zum Heute: Modellgestützte Landschaftsplanung
  • Future-proofed Urban Areas: Real Options in Urban Planning
  • Walking in the Territory
  • Eqasim: An Open-source and Extensible Platform for Building Agent-based Models
  • Designing with the Form of the Landscape
  • Using Virtual Reality to Evaluate Cyclist’s Perceived Safety
Kurzmeldungen
  • New Master of Science ETH in Landscape Architecture
  • New Professor for Landscape Architecture at the LUS
  • Tagung Landmanagement – Rück- und Ausblick
  • Der Stadtschreiber
Publikationen
  • Mutation und Morphosis. Landscape as Aggregate
  • Combining Urban Scaling and Polycentricity to Explain Socio-economic Status of Urban Regions
  • Understanding Traffic Capacity of Urban Networks
Stellenausschreibungen
  • NSL Kolloquium: Urbane Transformationen
  • Call for Papers: Public Space – the Real and the Ideal

Chairs

Prof. Dr. Bryan T. Adey
Prof. Dr. Kay W. Axhausen
Prof. Dr. Tom Avermaete
Prof. Dr. Francesco Corman
Prof. Teresa Galí-Izard
Prof. Christophe Girot
Prof. Dr. Adrienne Grêt-Regamey
Prof. Dr. Guillaume Habert
Prof. Dr. David Kaufmann
Prof. Hubert Klumpner
Dr. Anastasios Kouvelas
Dr. Markus Nollert
Prof. Freek Persyn
Prof. Dr. Christian Schmid
Prof. Milica Topalovic
EiR PD Dr. Joris Van Wezemael
Prof. Dr. h. c. Günther Vogt
ETH Wohnforum – ETH CASE

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