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.
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
I've had the same experience in Copenhagen. Their metro is fully automated, and the schedule is published as "one train every x minutes during rush hour, every y minutes otherwise", which is very nice. You just turn up at the station knowing you'll only have to wait that many minutes. The automation takes it to the next level as well, because the trains run on this schedule through the night.