Travelling across star systems constellation

So as you can see in the pictures, I’ve explored all of the star systems of Idmon constellation, so the question is “Is it possible to travel to another constellations via the interstellar highway or we ought to travelling off-road?” Because there isn’t any road connected between the constellations. If it is possible to go between constellation via the highway then is there any requirements to do so?

The requirement is to have the other side of the Constellation that you plan to go to, explored, therefore it will create a sort of “ghost” interstellar highway between them.
At least that was my case.

So we have to travel the other constellation off-road first, then explore it in order to have an interstellar highway between them?

At least that was my case, yeah.