The Australian experience, after considerable efforts, is that transponders are not practical for bikes (of course, the bike people may not have WANTED them to be practical

).
They are not waterproof. Nor vibration proof. Mounting is problematic (they are not small). Especially if the owner has multiple vehicles (they aren't cheap, you do NOT want to have to buy one for each vehicle) . And they give up completely on bikes without a battery.
Which is why the Aussies got so anal about wanting bikes to have a front number plate (that and speed cameras

).
But they have no given up on the front number plate idea.
Even with transponders I'd think that if you just ran through alongside a cage, the system wouldn't be able to figure that there were two vehicles in the beam.
And with cameras, keep hard to one side and it's bound to miss your rear plate. Assuming of course that a loose flap of ones waterproof overjacket, bungied to the pillion seat, hasn't accidentally flapped down over ones number plate. As can happen if one is careless with ones bungying

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