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Incidents

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The Minnesota Department of Transportation collects traffic data on the freeway system throughout the Twin Cities Metro area. This data is made public via XML files. There are two types of data; detector and incident.

Detector Data
Real-Time Detector Data ( http://data.dot.state.mn.us/dds/det_sample.xml.gz )
This file is in XML format and is updated every 30 seconds. It contains volume, occupancy, speed and flow data for each detector in the Twin Cities Metro area.
Real-Time Station Data ( http://data.dot.state.mn.us/dds/stat_sample.xml.gz )
This file is in XML format and is updated every 30 seconds. It contains volume, occupancy, speed and flow data for each detector station in the Twin Cities Metro area.

Incident Data
Real-Time Incident Data ( http://db0.carsprogram.org/MN/test.xml )
This file is in XML format and is updated every 30 seconds. It contains road construction information, road conditions and vehicle crashes.

Resources
The TMS configuration (corridors, stations and detectors) is defined in tms_config.xml.gz
The All Detector Report can be used for locating detectors and stations.
Mn/DOT has developed data tools for analysis of archived traffic data.
The XML specification for the incidents can be found here.
The incidents lookup table is required for some features in the XML file. ( Updated 2004.06.01 )
Use the city FIP codes lookup table to translate city codes into actual names.
Use the county FIP codes lookup table to translate county codes into actual names.
The station XML file requires three files in order to interpret the data. They are a shape file, an index file and a database file.
ESRI ( makers of ArcView ) has published documentation on how to read/write shape files