Since we will be in Houston in late May and spurred by this discussion, I called Texas toll authorities. We don't have a EZ-Pass transponder or such since we don't have toll roads out west (we believe in freeways). The response (exact words), "At this moment we do not charge out-of-state vehicles for tolls in Texas."
In response I asked, "What about next week or next month since I understand what next moment means?" It became clear that "at this moment" was the official language. I did pin this government official down when he said there are no plans to charge out-of-state vehicles for tolls in Texas in 2016.
Then he asked if I had any other questions. My reply, "Not at this moment."
2003 Monaco Safari Trek 2810
Coos Bay, Oregon