OP must of hit a nerve here but In games like city skylines a big difficulty of large cities built in the game is handling car traffic. A lot of which is solved by public transport, walking paths and other "apirational" city structures that are hard to realize in real life. I've watched alot of fun videos on youTube of a certain youtuber apply these techniques to other people's saves to great success. It's honestly a fun challenge to solve.