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Need traffic data? Commuters are more connected than you think

Need traffic data? Commuters are more connected than you think

Smart Cities Council Managing Editor Kevin Ebi explains how AT&T has helped cities gather traffic data through call logs.
  • Written by contributor
  • 8th March 2017

By Kevin Ebi, Smart Cities Council

 

Your best source for commuting data may be the device that most of us can’t live without: smartphones. Nearly everyone carries one and anonymous location data may be able to help cities build traffic models that are far more accurate than anything currently available.

For eight years now, AT&T has been using call logs to help New York, San Francisco and Los Angeles understand how people travel throughout their day. Every time you use your phone, that usage creates a record that includes the time and location. Combine just those two data points with the phone owner’s zip code and you get an idea of how, when and where people need to go.

There are already some useful insights, but as usage grows, this wealth of data could lead to robust models take more guesswork out of transportation planning.
 

First insights are in
Perhaps not surprisingly, people who live in New York City make very short trips. Half the people travel 2½ miles or less over the course of a typical day. San Francisco, however, is quite similar, with half of its residents traveling 3½ miles or less. In contrast, Los Angeles is much more spread out, which half of its residents traveling within a radius of up to 6 miles.

But it’s not just about knowing where people start and where they end up. You also get a good idea of how they get there, allowing you to more precisely pinpoint where the carbon footprint impacts are. In the case of Los Angeles, that’s not necessarily a straight line between home and work. Mountains northeast of the city force commuters to go around, creating significant carbon impacts well before those residents get downtown.

While the workday is an obvious first place to start, this call data can also help cities learn how people get to special events. AT&T studied how people get to and from parades, for example — providing more valuable insight for comprehensive transportation planning.
 

Building a transportation play book
For Los Angeles, AT&T Labs is working on a Connected Corridors Project using data to help the city forecast traffic. It starts with a giant cause-and-effect database. By learning how commuters react to accidents and other bottlenecks of varying severity in different locations, it can build a play book that allows transportation managers to adjust traffic signals and use other tools to more effectively ease the traffic jam.

A similar project in San Francisco, the SmartBay project, provided insight as to the best locations for park-and-ride lots and to run what-if scenarios to determine how best to manage traffic with temporary bridge closings and the opening of a new sports stadium.
 

Privacy matters
Assuring privacy is Job One. All data are anonymized before they are made available for traffic analysis.

However, some people have been willing to give up their anonymity because they see value in the research. In order to validate the initial findings, AT&T needed to find volunteers who would be willing to be tracked to see if the overall projections held true. Enough people opted-in that it was able to verify its findings against specific commutes. People do see the value.
 

Kevin Ebi is managing editor of the Smart Cities Council, which helps cities use technology to become more livable, workable and sustainable. Register to attend the Council’s Smart Cities Week Silicon Valley, May 8-10 in Santa Clara, CA.

 

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