I’ve never said it was the same. Somewhat comparable. In practice bridge is likely more expensive, if you take in the externalities accumulated over the lifespa

I’ve never said it was the same. Somewhat comparable. In practice bridge is likely more expensive, if you take in the externalities accumulated over the lifespan of the bridge full of cars. Engineering costs its a matter of volume, what kind of ground you need to dig, expertise and experience. If you can get something like the Boring company up, costs would drop down. And engineering costs don’t account for externalities of having a bridge full of noisy cars hanging there, polluting in every modality: view, noise, smell, splitting the neighborhood, reducing walkability, destroying the property value.