SH-99 Grand Parkway from US-290 to I-45 is now open. No tolls on this segment of SH-99 until February 15.
The Greater Houston Transportation and Emergency Management Center City of Houston Harris County METRO Texas Department of Transportation
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Houston Speed Map Archive Description arrow Map Archive arrow More Historical Data

The Houston Speed Map Archive allows users to view historical speed and travel time information from the Houston TranStar AVI (Automatic Vehicle Identification) Traffic Monitoring System from a user specified date and time. The maps and data are archived by Houston TranStar every 15 minutes, 24 hours a day and 7 days a week. The web interface gives users access to the archived maps. Users are prompted to select a map, date and time to view historical data from. The system then produces a map that shows how traffic conditions were at the date and time the user selects.