> If Musk could translate underground the approach he brought to reusable rockets, Flyvberg said, he could drastically reduce the price of a given dig.
The article mentions that the cost of digs are prohibitively expensive. Reducing costs could help LA and the people stuck in traffic all day.
https://www.oldnyc.org does something similar.
1. http://www.nyc.gov/html/records/html/photos/photos.shtml