For anyone interested in engineering failures, the linked article may entertain. I don't think I would like to stand under any of these spans.
http://www.smh.com.au/nsw/email-trail-reveals-highlevel-warnings-about-skytrain-safety-threat-20170111-gtpc6u.html
In a nutshell, there are concerns over the construction methods of the elevated part of the line. The government authority in charge of roads is not allowing the builders to build over the roads until they prove it will be done safely. The builders are under pressure to avoid this delay because they will be penalised for not meeting deadlines. Competing demands?