Note that not all lanes are connected: the outer tracks do the left turns, the inner track the right turns (it's left hand drive / LHD). So, to allow anywhere-to-anywhere connections I need to place lane changers between junctions.
This is my first real try to design a junction, so far I just copied good designs . So what I tried to make sure was (1) to have chain signals before each crossing and a normal signal at the exit points; and (2) that traffic that doesn't need to interfere doesn't interfere, i.e. opposing right turns can go simultaneously and the straight lanes in the same direction are all isolated from each other. I think those are the desired properties and that I managed to do this, but all feedback welcome!