The Harris County Toll Road Authority manages 126 miles of toll roads in Harris and Houston counties in the greater Houston, Texas, metropolitan area. Drivers need an EZ TAG to use the electronic tolling facilities on the roads.
The Westpark Tollway, Katy Managed Lanes, Tomball Tollway and the Sam Houston Tollway are part of the Harris County Toll Road Authority. The Westpark Tollway begins at I-610 and runs 13 miles to the county line near FM 1464. The Katy Managed Lanes include 12 miles from SH 6 to IH 610. The Tomball Tollway is a six-mile all electronic toll road that runs from Spring Cypress Road to FM 2920. The Sam Houston Tollway is 70 miles long and is the outermost loop around Houston.