i want a miniaturized LRAD so on my bicycle I can have a Gertrude but for communicating with the occupants of motor vehicles

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i want a miniaturized LRAD so on my bicycle I can have a Gertrude but for communicating with the occupants of motor vehicles
no idea how this would/if this could work in practice but i've been seized by an intense urge to figure out how feasible it would be to take a device like a TMS coil and modify it to sympathetically vibrate the transducers of a car's speakers, at its most simply to make a loud noise but ideally to broadcast some message like "on your left"
if the electronics would be too shielded to achieve that then maybe something like resonating a car's windshield to make it behave like a speaker, functionally speaking. you know the more i type the more this idea sounds like unachievable science fiction, especially as miniaturized as to fit on a bike
LRAD is easy mode, the issue is the smallest I've seen of homebuilds (for testing ways to thwart them) is about 2ftx2ftx0.5ft