Quick tip that might work for some...
In Illinois, you can register your motorcycle license plate on the same account and transponder you have for your car. By doing so, when you go through the automatic toll booths, it reads the plate, and takes the toll off your car account - even if you don't have the transponder. Same principle as when the transponder battery goes bad. It will just check if the plate is registered to an account and if so, it will subtract from that account, instead of citing a violation. I've never had a transponder with me, and it always charges my account properly. I also put my kids plates on my single account too and that works fine.
Now, the only potential problem is, if you go to a manual lane, with a person in there, I don't think they can look up plates. So they will force you to pay to open the gate. If there's not a gate, just zipping through a manned booth will probably case you some issues of the Barney Fife variety, so just make sure you go through the Zoom lanes, and nothing with a person and/or a gate.
Works in Illinois at least.