Comment by breck

Yes, it is. With one that caveat that if it's built 10x cheaper than comparable tunnels, it is. Moving our roads underground is a vastly superior transportation system than we have today. It can be safer, better for the air, better for light and noise pollution, unlock vast amounts of land in our urban areas for parks, etc. I grew up near Boston during the big dig and the city is a drastically different place before and after the Central Artery. The same is happening in Seattle now. The problem is the cost. If Boring Company can solve that (and he already has a history of doing comparable things in the rocket and battery industries) it very much is the future of public (and private) transportation.