In all honesty, all UO had to do was erect 2 poles on either side of the near miss loop and stretch a mesh inbetween them, the same one used in paintball fields, and call it a day.
Its not a difficult solution, they make the net taught enough as to not interfere with either coaster including wind holes on either side of where the coasters pass so nothing splits through and thats it.
Doesn't take a genius to figure this one out.
This would take them a week to erect, tops.