I know I've said it before in several movie threads: I hate how they don't have a simple engineer anywhere in the production offices that can say, "The bridge wouldn't do that if you sever the main suspension support." They are getting bridge shit wrong that I learned in high school 25 years ago.
So these guys wrote a little paper on it.
http://hackaday.com/2015/11/18/suspension-bridges-of-disbelief/