how do you get the road that is hidden road to appear.

In which area are you talking about?

i'm in mosphoran highwaste /babbling vale

are you go say anything?

if this is youre 1st time in "mosphoran highwaste " then tou cant go to the hidden place [they area in the maps that you cant reach],

but if ypu camed back later, those shrines in the middle area only where the crystal save and people are can be operated, you well notice that in the west side there is a big rock blocking youre path, to bring it down and go to the small unreachabe place follow this:

1st you will find waters are coming out from all the shrines in this place, and you can hit a switch to to operate them.

open all the 3 east shrines, the wAter will evaporate, this will lead to a new path, open the Map of the area and you will find "!" marks in it [3] then exit from "north east" most of the place, you will find a Chocobo [area name : Rays of ashen light] these "1" marks indicate a new path is open, go to the lownt mark then follow the road while riding the Chocobo [you will come to area: Empyrean way], there you can walk through the bushes to lead you to area : "Sky reach ridge" from there:

exit back to "babbling vale" then you can lower the rock there, open the shrine there, then head down and open the NORTH SHRINE [there should be a human-moggle-and a lizard, the human tells you about the shrine secret].
OPEN THE MAP, you'll find a new Marks [2 "!"] in the WEST side in "Skyreach ridge"
now HEAD BACK TO SKYREACH RIDGE , afcourse prepare youreself, cause the path will lead to the small area in the map [Empyrean seat]

you get to Fight EXODUS [esper], good luck.