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This was discussed in the comments to the Hell Rotaries post: the Alewife interchange. They photographed it at an off-peak time, so you can't really see the full glory of it.
Note that aside from the three through routes meeting there in a six-legged asterisk, there's actually another leg coming into the center from the Alewife T station.
Note that aside from the three through routes meeting there in a six-legged asterisk, there's actually another leg coming into the center from the Alewife T station.