Saw this mess on the news recently. The part that failed was where the road was connected to a very narrow single pilon. Way under designed in my book, not that I'm qualified to build one of these elevated roads but it had the room for 2 pilons and 2 the same size as the single one would hold that up. Not a not of reo protruding from the top of the broken pilon and it was not very long where it would have been connected to the road itself so not tied in place properly.
Cheers Cobba & Cobbarette
Coopernook, The Centre of our Universe.