...if it does, this may be a time saver as those double-arrows are insta-transports.
They become more important at lvl 50 when daily quests can be had way up north and way down south-west. There's like 8 dailies for lvl 50's here, maybe more. And 3 of them are heroics: lvl2, and 2 lvl 4's that I've stumbled into.
I have one other planet to check where I recollect running into high lvl stuff.
There, a better visual. Now for a better explanation:
The circled taxi locations are not your traditional fare (ahem), they are insta-travel from one location to the next. But each taxi delineated by a color can only insta-travel to a same-colored taxi.
Thus, there are three insta-taxi lines.
Note: the very long taxi long from way up north to way down south, each may be surrounded by lvl 50 content so it may be more trouble than it is worth to tag each end of that line until such a time as it makes sense.