Everything about Alamo and the rental car was great, except for one thing. We picked up the car very late, 11:15 pm, due to a flight delay. There was only one agent at the desk, and in working with him to check out the car, I asked if the car has a toll road transponder (having done my homework and knowing that many of the freeways back east are tolled). He said yes, that it did. However, he did not mention how to use the transponder, and provided no additional information on the transponder. Having never driven a rental car on the east coast before, I was unaware that the transponder had to be "opened" in order to be read by the cameras. It wasn't until we hit a toll road with a gate that that gatekeeper informed us that we needed to swing the transponder open for it to work. Unfortunately this was about two weeks into our trip, when we had driven through at least a dozen toll booths in the "EZ Pass" lanes, thinking we were good to go because "we had a transponder"! I come from Washington State, where our HOV transponders are always "on", and the only thing we have to change it to indicate if we are YES to HOV or NO to HOV. We don't have to "open" anything for the transponder to be read. So please make sure that your rental agents always tell people about having to "open" the transponders.