EZ TAG vs TX TAG what’s the difference? : r/houston - reddit
TxTag is issued by the Texas Department of Transportation while EZ Tag is issued by the Harris County Toll Road Authority (HCTRA). EZ Tag should work everywhere or almost everywhere TxTag works. If you are getting bills from TxTag, then your EZ Tag may not be working correctly and/or your license plate may not be up-to-date in the HCTRA system.
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