“Each toll gantry has cameras that can take a picture of the driver’s license plate, and from that, a bill can be sent to him through the mail.”
But the bill is not just for the toll. The bill includes a big fat admin fee. Here in VA, I think the fee is around $12. I would expect that John Law can give you a healthy piece of paying paper when he pulls you over for some other infraction and finds you without an ezpass. The signs requiring the expass device are yuge and series.
Let me make sure I understand—a tourist driving through Virginia is supposed to have an Ezpass?