Boston, like nearly every U.S. city, ripped out large swaths of its core to accomodate motorists in the 1950s and 60s. Boston’s downtown freeway was called the Central Artery (a great name, that sounds even better in the native accent). In the 1970s, Boston, like most places began to realize that freeways tend to break up the organic pattern that makes urban living interesting and attractive.
So the planners came up with a plan to correct the plans of the planners who tore out the city’s guts to build interstates. They would bury the Central Artery. Put the traffic underground, and instead of a noxious concrete wasteland dividing neighborhoods, there would be an open green space at ground level to re-unite Bostonians.
Minneapolis dreamers have a similar vision. I’ve seen sketches of a park built over I-35W around 35th to 38th Streets. It would expand an existing park (MLK) and repair a gash in the Field, Regina Northrup neighborhood. Since we just reconstructed I-35W in south Minneapolis, that plan will be locked in the dream stage for at least a few more decades.
Which is good, because in Boston, all they did was change the color of the barrier from gray to green: