I think most technically do that here, the transponder is more as a backup. With one exception— the DFW airport will only read NTTA tolltags for some reason las

I think most technically do that here, the transponder is more as a backup. With one exception— the DFW airport will only read NTTA tolltags for some reason last I heard. There’s also some interoperability- my Texas TollTag works in Oklahoma and one or two other states so it’s all consolidated with the lower rate. Those with TollTag accounts pay a lower rate on toll roads as it acts more like a gift card than a bill, it just autoreloads each time your balance gets low. Another cool thing is that some parking garages can read your TollTag if you let them to open the gate for you. It doesn’t bill you, it just acts as an access card if you have a standing agreement with the garage owner (you can see this at UT Austin for permit holders).