Early on in the game, a guide posted here to the Lodestone explained the names of several of the main roads in the game by the names the maps gave them.

Seen Here:
http://lodestone.finalfantasyxiv.com/pl/topics/detail?id=44a5dbf09bf4036bee6eb412a21bad70f571e50d

In Ul'dah, it referred to the name of the road that spans West-to-East from the docks to the Black Shroud as the "Royal Allagan Sunway" and the road that went from the Sunway to Ul'dah as the "Royal Allagan Starway."

In the game, however, they're both labelled as the Sunway.