$15 billion plus interest. More cars into Boston. Starving transit projects. And still no connection between North and South Stations.
Confronted by the deteriorating Central Artery back in the 1980s, we could have chosen not to replace it at all. With the I-90 connector and Ted Williams Tunnel in place for a fraction of the cost, I-93 could have been turned into surface boulevards from the mouth of the Dewey Square Tunnel at South Station to Charlestown.