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[kalvado]

Rather than mimic 3 spans of different heights, they could have done something like a trapezoid that wouldn't buckle.

I suspect this is the problem with engineers' perception of structural FEA. There was a pretty high profile (as in billions lost) similar case in Boeing 787 program.
And I am afraid even to think of how many things end up deep into their safety margins in similar scenarios.

Engineers are responsible for structural feasibility. The structural engineers should have been the ones to decide design.

Well, the buck (I mean DA) stops at PE stamp on the design. Those working for the firm without PE doing actual FEA and design also didn't do well.
Overall, I am not going to apportion the responsibility - there is always many things to consider and multiple people to blame. But I hope you're not going to deny responsibility of design team?
 

You are missing the fact that the design is done by engineers.

Talking about engineers... there had been a great tradition of an engineer standing under the newly built bridge...

[vdeane]

The potential concepts for the Troy-Menands Bridge alignment have been posted to the study website.  Note that the concepts are just of the bridge alignment; exact details of how it would tie in on each side are beyond the scope of this study and what is shown is just placeholders, although reducing the footprint of the I-787/NY 378 interchange is a goal.

https://www.dot.ny.gov/troymenandsbridge/reports

[The Ghostbuster]

All 9 of the Concept Corridor alternatives have the Interstate 787/NY 378 interchange being converted into a diamond interchange. I wonder if the ramp terminals of the converted interchange will have stop signs, signals, or roundabouts? Which one would be most likely?

[froggie]

^ Given traffic volumes, I think it's safe to say that stop signs aren't even in the picture.

[seicer]

That's interesting - aren't there queueing problems going to and from Troy that make a diamond configuration an issue with backups? Or were the backups because of the mess of intersections east of the river?

[vdeane]

The backups are due to the intersections east of the river, especially with all the traffic trying to get to HVCC and then trying to cut the corner down Morrison instead of heading up to US 4.  Even trucks occasionally try to do that, only to get stuck because there isn't enough turning radius for them at that intersection.

As for the I-787/NY 378 interchange, do note that the diamond is only a placeholder.  The actual interchange could be a SPUI, DDI, or something completely different (and could well be affected by the findings of the related I-787 study).  They just needed to put something there to have a rendering.  The point of the study is mainly to engage stakeholders and the public and document feedback and issues relating to the bridge alignment concepts.

[Alps]

They need to do something for 378 west to 787 south. That is a heavy movement; the corresponding N-E is a direct right turn under any scenario.

[Rothman]

They need to do something for 378 west to 787 south. That is a heavy movement; the corresponding N-E is a direct right turn under any scenario.

So, coming from Troy?  Yep, definitely.