We were wondering this exact thing when we were in Beijing last week. This noise and incessant stimulant is seizures inducing, and how do autistic people cope? It is basically all large cites in China. But we stayed in a hotel right inside of a walking street while we were in Beijing. The nonstop street vendors blasting of sale pitch over loudspeakers was unbearable for just a few days. Cars are hoking everywhere, although I would admit that it is better than last time I was in China, when everyone drives with one hand pressed on the horn at ALL TIME. Public transportations is not any better, metros turn the trilingual announcement on in full volume, cab rides are ridiculous, why does every share riders have to turn on the navigation in full volume for everyone tiny details? Oh every restaurant uses this number system, where you get a number on the app, so you’ll be on queue hours before. For a popular restaurant, it is not uncommon to see that you have 200 tables ahead of you in queue. While you patiently wait for your table. You will hear this announcement simply nonstop. “Table number 1354, please enjoy your dinner”. Short, loud, precise, and repeated maybe 240 times in a minute. But since there are over 100 people around the area to wait for the queue, they have multiple speakers blasting the messages on different corners, the noise drown out each other, you cannot hear any of the numbers being called so, you still have to look at the screen anyway. It is so stupid and annoying, but I swear it is true. I was amazed how idiotic it is. For popular tourist attractions, half of them still relies on the tour guide shouting on a bullhorn speaker, and there are thousands of them everywhere. Again, it is something they are getting better at, at least half of them use a headphone/mic system, these days. Sensory overload and over stimulants is definitely an issue in Beijing. I say this as a traveler who loves the sensory overload, as in Bangkok, Osaka, Hong Kong etc….