I always love the public address trucks in Mexico. These days, sound systems have far better fidelity and tend to be carried around in vehicles more appropriate to the size of the loudspeaker. In earlier years, it was not uncommon to see a 1970 Volkswagen with a gigantic speaker duct taped and shock corded to the roof of the car. The speaker was often almost as tall again as the car itself and wobbled precariously on each pothole and turn. You could not always decipher the message being blared because the speaker was so overdriven that you heard more distortion than words (and the words were often laid on top of blaring banda music).
You don't hear them nearly so often now, and when you do, it is a little more professionally put together sound system. I suspect if this was mid-election cycle, you would see and hear far more of them.
Walking up the hill to Billy's Gym today, I did bump into this one:
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