Need help making a road system for ai cars and pedestrians (like Cities Skylines)

But really i want to know how to make this myself and i want to know how something like Cities Skylines’ traffic works. I don’t really have the money for a plugin.

I’ve also found a good pdf (http://www.artifactgames.de/Resume/DA_JanKrassnigg.pdf) on how to approach this, but i don’t know how to recreate that in UE4.
How do you make something like this?

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