I found that my favourite junction is the so called https://wiki.openttd.org/Spaghetti.
But it lacked a little in capacity, so I tried improving it, in my way. I also reviewed the variants, but none fitted my "style"

After a bit of study I could build it without the need of the U turns, so here is my suggested improvement.
This is the basic style, tunnel only.
The only long unsignaled track is the underpass, of course.