Los Angeles has one of the world's most advanced traffic detection systems, enabling it to manipulate traffic signals on the fly by using real-time data. But This data is saved for only a few days, limiting the extensive data's long-term use.
"The data beep and shine on screens in a state-of-the-art traffic control center that looks like something out of a science fiction movie. The information -- Wilshire Boulevard jammed in Westwood, Broadway wide-open through downtown -- is used to adjust the timing of traffic lights, easing the flow of vehicles through the city's busy streets. The data are instantly placed on the Internet, available to commuters and traffic reporters."
"But although the sensors and computers collect massive amounts of data about traffic patterns and congestion, they do little to help engineers plan for the city's growing transportation needs -- or determine how development is affecting traffic."
"That's because the city does not save the information for more than a few days, using it only to direct traffic in real time by adjusting the speed at which lights turn from green to amber to red."
"'It's appalling,' said Councilwoman Wendy Greuel. The chronic lack of information makes it impossible to determine 'where density should go and where it shouldn't go.'"
FULL STORY: L.A. doesn't save data on traffic growth

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Planetizen Federal Action Tracker
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Urban Design for Planners 1: Software Tools
This six-course series explores essential urban design concepts using open source software and equips planners with the tools they need to participate fully in the urban design process.
Planning for Universal Design
Learn the tools for implementing Universal Design in planning regulations.
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Gallatin County Department of Planning & Community Development
Heyer Gruel & Associates PA
Mpact (founded as Rail~Volution)
City of Camden Redevelopment Agency
City of Astoria
City of Portland
City of Laramie