I'm not sure how to research it, but since Universal Blvd. was carved out of the center of the property by Universal back when they owned all the land on both sides of it specifically to connect the two parts of the property, isn't there (a pretty good) chance that they put in place some kind of variance for using the road right of way for a transportation system of some sort? They had BIG plans and dreams for the Orlando property back then, and I can't imagine they would have forgotten to connect the parks with some sort of transportation. I would guess as part of building Universal Blvd, then turning it over to the roadway authorities they may have come up with a right of way agreement for (elevated) transportation to follow the same route. Just like they had the land zoned for theme parks and resorts years ago (so they don't have to get new approvals now).