Hadn’t they designed a bridge, they were getting ready to build it, and it was changed to a tunnel.

It does make sense since tunnels won’t need to closed for high winds like bridges do.

I might have misremembered bits of this.

You're describing a perfectly normal and healthy development arc.

An initial study into a problem poses a preferred solution.

Time and effort is put into deep study of the solution path. Unfortunately, in this case the study proves it is far less ideal than initially assumed.

The project is switched to Plan B.

Granted, sometimes this kind of early change in direction is for dumb or dishonest reasons, but one cannot perfectly know the results before the studies are completed.

I am in rail design. We are currently designing things for needs in 2030-2060. The world is complicated.