Sometimes garbage collection trucks will drive by with a recording blaring from an attached loudspeaker, but that's not what I'm specifically referring to, because those announcements tend not to be too loud. What I'm mainly talking about here are political campaigning messages. I've never seen this kind of advertising in any other country, and it reminds me of the way propaganda vans drove around the Soviet Union.
Basically they just drive around yelling "Vote for so-and-so! Thank you very much!"
I can't be the only one who finds this kind of noise pollution extremely annoying.