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I talked to an engineer about your challenge. There are a variety of approaches to prevent stray reads across multiple lanes. You should be using vertically polarized RFID antennas, which would put out an RF beam front to rear of the car, or into the lane. If you are using a circular polarized RFID antenna, this creates a rounded RFID field and can cover lanes to the left or right. You would definitely not want to be using horizontally polarized RFID antennas. There are a variety of ways to block the spilling of RF signals between lanes on toll roads, and if the antenna polarization is not the problem, a shield would help, typically with metal that reflects signals back into the lane.
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