I drive through this interchange twice a day at least. It sucks (there isn’t a nice way to put it, sorry). From 290, there’s often a backup onto 495 south, which in turn gets backed up because of the proximity of the onramps from 85 & 290, on an uphill grade, followed shortly by the exit to US 20 west. Northbound on 495 is no better – too many people who decide at the last minute to suddenly cross 2 lanes of traffic to get onto 290, because they didn’t want to wait in the line of slow moving cars on the right.
Milford to Hudson via Marlborough.
First appears in 1933 map on the same route it has now.