It ends up being the path of least resistance. In many places, there are wildlife fencing around motorways, but it always ends up with holes and animals crossing via the holes, mostly because the animals want to get to the other side and don't find another way. I've never seen those kind of "hanging jungle bridges" like the article talks about, but "wildlife bridges" which literally are bridges with just earth/tress/vegetation on top I've encountered a bunch of times. When those exists, the animals who want to cross can then find a path to get to the other side, without resorting to making a hole in the fence and crossing the roads.

They probably see it as an easier crossing than coming down out of the trees to cross the road at ground level. They might feel it's safer too, as being on the open ground is more exposure to predators, which they would instinctively avoid.

Apparently, they do