Interoperability
- EZ TAG, operated by Harris County Toll Road Authority and Fort Bend County Toll Road Authority (Greater Houston)
- TollTag, operated by North Texas Tollway Authority (Dallas–Fort Worth metroplex)
Since 2003, HCTRA's EZ TAG and NTTA's TollTag have been mostly interoperable, with the exception of Dallas/Fort Worth International Airport and Dallas Love Field airport parking, where NTTA's TollTag is the only ETC system recognized. TxTag transponders are accepted at all designated lanes on HCTRA and NTTA roadways. EZ TAG and TollTag are accepted at any TxTag locations.
TxTag transponders are currently not accepted:
- At tolled border crossings with Mexico, although future interoperability is planned with the Laredo Trade Tag accepted at four crossings.
- By any toll authority outside of Texas.
Read more about this topic: Tx Tag