Lots of the components in wind turbines are custom made, CNC milled, etc. with more scale and focus on cost optimizations they can get far. As for the bridge:

Lots of the components in wind turbines are custom made, CNC milled, etc. with more scale and focus on cost optimizations they can get far. As for the bridge: the concrete business doesn't see a lot of innovation. Still if corrected for inflation and aiming for similar durability, it wouldn't surprise me if today's engineering can build cheaper bridges. After all, we've learned a thing or two about suspension bridges over the years.