Damned i mixed myself with LHD / RHD.
My question was, what exactly do you mean by "You should let left turn drive to the left first and not to the right first" (RHD perspective)
You mean before the middle cross ?

Ahhh, ok ^^
How would you " You should let left turn drive to the left first and not to the right first" ? (LHD perspective)

Were you talking about the left turn after the middle cross ?

This intersection is really designed for 2 levels, as everything is in one level in factorio the left turns doesn't make sense. They cross many too many paths. You should let left turn drive to the left first and not to the right first. Sorry, i'm confused, i'm not sure to read your words properly....

I got a 2 way, 415 trains on 5 minutes => 83 trains/minute (3 length trains) This solution has some good sides : - Trains can turn back by crossing the middle section three times. - It can be scaled without too much cooking - The flow is good, the main slow down come from the middle horizontal verti...