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ITS Research Program, UW

TDAD: Traffic Data Acquisition and Distribution
      an ITS Archived Data User Services (ADUS) Data Mine

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Want detailed queries?
Want to know the number of cars
passing any point in a day?

This project was developed with the sponsorship of the Washington State Department of Transportation.

The Traffic Management System at WSDOT was initially designed to support their highway monitoring and control operations. The TrafNet project used the data produced by the TMS to assist Seattle-area commuters. The TDAD project makes the same information available to a third group: researchers and planners.

The TDAD database collects the output of the TMS over time. Every twenty seconds, a new "snapshot" of the current highway conditions is added to the database. The collection was begun on October 13, 1998 and has been operating continuously since then. This process will be maintained over time so that long-term trends can be measured with data obtained from the system.

The TDAD Query Interface provides a web-based front end to the system. Using this tool, a query can be refined and submitted, and a text file containing the requested data will be made available for download. The data can then be imported into other programs for further analysis.

The TDAD Query Interface requires Internet Explorer 4 or greater, or Netscape Navigator 4.08 or greater, with Javascript enabled.

A diagram of the TDAD system is available, as well as a list of Frequently Asked Questions.

Analyzing daily traffic counts is a high-level application of the data stored in TDAD.

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(October 31, 2000)