Youth Perspectives

A new way to predict traffic flows

David Chandler
Share:
The Big Picture
Explore and monitor how Innovation is affecting economies, industries and global issues
A hand holding a looking glass by a lake
Crowdsource Innovation
Get involved with our crowdsourced digital platform to deliver impact at scale
Stay up to date:

Innovation

A reliable way of predicting the flow of traffic could be a great convenience for commuters, as well as a significant energy-saver. During an emergency evacuation following a natural disaster, reliable predictions of the best routes could even be a lifesaver. Now a team of researchers from MIT, the University of Notre Dame, and elsewhere has devised what they say is an effective and relatively simple formula for making such predictions.

The findings are reported in a paper in the journal Nature Communications by researchers including Marta Gonzalez, an assistant professor of civil and environmental engineering and engineering systems at MIT and Zoltan Toroczkai and Yihui Ren at Notre Dame.

The authors, all physicists by training, have been applying their knowledge of the computational modeling of complex systems to human-scale systems, such as traffic flows or the spread of disease. Their work has found patterns in these human systems similar to those seen in models of physical systems, the researchers say.

Traffic has traditionally been modeled using so-called gravitational models, but these have severe limitations, Gonzalez says. For one thing, such models have great difficulty adapting to changes in a network, such as those reflecting construction or emergencies — but the new model can handle such changes easily.

The system deals with the difficult-to-model human choices of destination sites, as well as the similarly difficult problem of choices of travel paths. In earlier work, Gonzalez and her colleagues developed a variation for the first ingredient of what is known as a “radiation model.” Such models are increasingly being used, but for traffic predictions, Toroczkai and Ren modified the model to include cost-based constraints for travel in the network, with travel time as the “cost” to be minimized.

In this application, certain locations — for example, daily destinations for many people, such as the MIT campus — are “absorbers,” pulling in vehicles from many directions; the locations where people live are “emitters.” In the new formula, the average number of travelers planning to go from point “A” to point “B” each day corresponds to voltage in an electrical system — essentially, the “pressure” between any two points — and the average number of travelers who actually follow a given road during that commute corresponds to the electrical current, or the actual amount of flow in such a system.

As input to the model, the researchers entered data on population distribution, from the U.S. census, as well as information on where people work and the basic structure of the highway network. Predictions made from the model have been tested, and found to correlate very well with actual traffic.

The radiation formula has enough flexibility that, having been tested and calibrated with U.S. traffic, it can be applied in areas where initial data is much more sparse. “It has been tested in South America and Africa,” Gonzalez says, with good results.

In disaster situations, the model might make it easier “to know how the system is going to be disrupted,” she says, and identifies critical points that may produce bottlenecks. The same basic modeling can be applied to any network flows that include human choices, including predicting patterns of the spread of disease.

“This work fills a gaping hole in our understanding of — and ability to predict — network flows,” says Stephen Eubank of the Network Dynamics and Simulation Science Lab at Virginia Tech, who was not involved in the study. “This work introduces a defensible approximation method that takes maximal advantage of available data and is well-calibrated to actual flows, yet can be applied to hypothetical circumstances. These features ensure that it will have a significant practical impact on transportation planning.”

The team also included Maria Ercsey-Ravasz at Babes-Bolyai University in Romania and Pu Wang at Central South University in China. The work was supported by the Defense Threat Reduction Agency, the Defense Advanced Research Projects Agency, and the National Science Foundation.

Published in collaboration with MIT News

Author: David Chadler is the Director of the Centre for the Study of Democracy and Professor of International Relations, Department of Politics and International Relations, University of Westminster, London

Image: Traffic crosses over the new diagonal crossing at Oxford Circus in London November 2, 2009.  REUTERS/Stefan Wermuth

Don't miss any update on this topic

Create a free account and access your personalized content collection with our latest publications and analyses.

Sign up for free

License and Republishing

World Economic Forum articles may be republished in accordance with the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Public License, and in accordance with our Terms of Use.

The views expressed in this article are those of the author alone and not the World Economic Forum.

Related topics:
Youth PerspectivesJobs and the Future of WorkFinancial and Monetary Systems
Share:
World Economic Forum logo
Global Agenda

The Agenda Weekly

A weekly update of the most important issues driving the global agenda

Subscribe today

You can unsubscribe at any time using the link in our emails. For more details, review our privacy policy.

2:05

This computer game makes students better at spotting fake news

Andrew Moose and Ruma Bhargava

April 5, 2024

About Us

Events

Media

Partners & Members

  • Join Us

Language Editions

Privacy Policy & Terms of Service

© 2024 World Economic Forum