Yes, too many variables, and great topic.
What I noticed during my experience is one thing that is actually very natural and common sense, but I did not think about it (before I got in that situation)
Thing is that in urban area during major SHTF roads, ways, routes that are still there but everything get new dimension because you simply use alternate ways, like shortcuts trough the abandoned buildings so you can get somewhere and similar.
Intersections for example gets not usable because numerous reasons, or bridges and similar points, and you use alternate ways or “roads”.
All this goes for urban areas, and in today plans it make sense to notice dangerous spots, so you can have some plans to avoid it.
What looks today like straight and easy way from point A to point B when SHTF can be very complicated travelling that actually takes 5 times more energy.
Traveling long distances on the other hand always is a game of how much information you are giving about yourself to somoene who might see you while you are gathering same informations.
Your clothes and way how you “stand” can give informations to other about lot of things like are you stranger, armed or not, are you sleeping outside, hiding not hiding…
Again too many variables, but consider small excersize of entering mall today in order to gather informations about shops inside, or particular items. Are you gonna go inside and obviously look for it, or you are wandering, or talking on phone and in same time looking for it, or you taking photo of it but on a way that you are like making “selfie”…
It is always about giving or not giving information about yourself while you are performing task.
Worst case scenario, and scenario that you need to be ready for is plan that you gonna walk all the way.