While there are ways to make yourself impervious to AET, I would recommend paying the toll or taking a free road. I believe people have been caught doing the license plate-covering trick.
Great idea but they’d just put RFID tag readers in vehicles once they caught onto that, then they’d come out with RFID signal blockers then progress to biometric readers on the drivers. As long as they have our money to develop the technology the fleecing will never stop.