HoMM3 HD is a mod (add-on) for the game Heroes of Might and Magic 3.

Hey, did you do all this yourself?
True, only the most "convenient" options were considered.
Why can't all 4 nodes in the center be connected by roads? Are roads along 2 opposite sides also possible, or even none at all (is that right)?

On 8mm6a, one-way roads appear rarely but accurately, on the most important route, towards the center.

Is this based on experience, or are there any logical reasons for this?