The shape of the commerce lanes doesn't fit this kind of map IMO. They seem to be curving and meandering as if they were roads built over natural terrain, which they of course are not. I think they'd be much better represented as straight lines, or even elliptical curves. It's not like the 2D map is capable of accurately displaying the courses of spacecraft anyway.

I'd prefer using long dashes over dots myself, but that's just a matter of taste.