I work in Texas, and our structural engineers follow TxDOT for any bridge work, no matter the project size. Primary reasoning is that TxDOT has details for all of the different parts that go into the bridge, and the engineers don't want to redo any of that work. The only part of it they do is the analysis, which they still do using the older non-graphical programs TxDOT provides for free.
I want them to start using IW for bridge layout and analysis, so that I can maintain that dynamic link as I bring it into Civil 3D for plan production, but we can't afford to put the time into making the bridge content for that to happen.
I'd really like if we can have the DOT content out of the box. This makes sense especially for the larger DOTs in the nation, if not globally.
TxDOT Bridge Details