C.J. Hughes, reporting for the New York Times:
Though details are still being worked out, the plan calls for building streets, sidewalks and buildings on platforms above the existing highway. The city’s grid in the area would be restored, creating a more pedestrian-friendly environment, and the Hill would be reattached. The highway will have fewer exits into the city and will lead directly into parking garages.
I’ve seen the future of urban highways, and it’s underground.