Fine tuning the city to avoid massive rebuilds and expensive motorways
Once you have settled into the basic mechanics of Cities Skylines with a functioning transport system, the zones nicely laid out and the civic infrastructure all working does the fun really begin.
Fun what fun?
As the city gets larger it gets more complex as an organism especially if playing modded as I do. This means regular check ups across the City to make sure the transport and transit systems are working as optimally as they should. The good news is that most fixes you come upon are not major and can be done very quickly and cheaply. That said from time to time a major overhaul might be needed but that is for another day. The point being that six lane roads and motorways are not and should not be the go to fix – PUBLIC AUTHORITIES TAKE NOTE.
In this post I go through some medium and advanced play throughs in using some extended tools to help fine tune your City as well as giving it more realism. Note: I use Real Time Mod which simulates the full day/night cycle and includes the rush hours, shopping, events, and shift work effects upon a City. More HERE.

Standardised Cargo Terminals that also work for Transit Hubs
Using Traffic Flow Tool, TMPE, and basic fixes to get traffic going
Tactical Urbanism 102 in Antarctic City – the Downtown
Tactical Urbanism 103 using one way streets in a leisure district
Using TMPE, Line Marking Tool, and Decals on Roads (Advanced Play Through)
Using Transport Lines Manager to check up on Transit
Of course as the City continues to grow and evolve more checks and tweaks are done, especially as more transit lines are added and old ones might need replacing.
I can be found on Twitch doing Cities Skylines play throughs: https://www.twitch.tv/palpatine001