People who have never been to L.A. really have no idea how insanely huge it is. Driving to my apartment from the start of city (before you even get to L.A. county) and having the city just keep going and going and going for two hours and not because of traffic jams is something you have to experience to truly understand.
Taking the idea further, it is notable that the entire population of California is smaller than that of Tokyo.
Tokyo is also unfathomable large, but the most astonishing thing is the amount of people. Tokyo has about 10 times the population of L.A. on an area of the same size. Of course there's traffic jams too, but not as bad as in L.A., because the metro system is a lot more efficient than the highways. During rush hour each train carrying thousands of people depart from each station every 2-3 minutes. You have to see it to believe it.
I was in Tokio last year and it's really amazing. I have never seen such perfect efficiency and punctuality, and I'm German! A huge factor though is that all the people follow the rules and are mindful of everybody else. Nobody standing in the way, nobody pushing or shoving other people. Also, despite being a mindboggingly huge metropolis, there seem to be hardly any traffic jams. The world could learn a lot from Japan concerning transport.
One of the big reasons we can’t have nice things in the US. High speed rail, for instance. There’s just plain old NIMBY, to start. Concern over property values. Then eminent domain. Then the lawyers drag it through courts over whatever argument because billable hours. We haven’t even looked at what expensive safeguards are necessary because every idiot will try to get around the rail crossing restrictions or do shit to the tracks thanks to “me first” and a complete lack of social responsibility like Japan displays in this context. Then every fool politician will try to starve it of funds because good public transportation costs money, and we can’t have evil taxes happening when you should buy a car or pay for an airline ticket. Hundreds of millions spent and we can’t even get started thanks to people just placing their wallets and special interests first.
Even though Tokio is absolutely massive, it's just a nice place to be. Not loud or overly crowded (apart from the tourist spots). Its clean and you feel safe. You also don't feel like you'll get scammed on every corner
There is no reason to push and shove and stand in front of the door to get in before letting people out if there is a train every 3 min. Seen the same in Singapore. You arrive at the station, see your train is already there but you dont care. You dont run you dont rush because it doesn't matter. You just take the next one
Paris is quite insane too, smaller but with an insane number of inhabitants per square km. Their metro isn't as clean but ut shuffles people around for sure, 650.000 passenger per day for metro number 13 for example. Or so it was when I lived there.