Information about the State Highway 121 toll road in Denton, Dallas and Collin counties is now available on the North Texas Tollway Authority's website.
Toll operations of SH 121 transferred from the Texas Department of Transportation (Texas Tollways) to NTTA in April of 2008. Customers who use the toll road without an electronic toll tag will receive a ZipCash invoice from NTTA. Any bills sent by Texas Tollways for travel before April 5, 2008 must be paid online at TexasTollways.com, by phone at 1-888-468-9824 or by mail.