Any good guides/tips for setting up efficient teamster layouts and late game public transit?

I am finally falling in love with T6 after all these years being a T4 loyalist. One problem I am having is that I have a hard time understanding **when** my transport network is running inefficiently, it feels like my citizens aren't spending very much time at their jobs compared to the earlier eras and production is slowing down a bit.

Traffic isn't a problem as I have basically skipped doing any parking garages whatsoever as my last game failed due to too much traffic on the roads.

I just don't understand how **far is too far to walk**, how **far apart bus stops should be**, and **when/where I should be putting metro stations**. Any advice?