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.
Improvements to Interstate 495/290 are sidelined – Framingham, MA – The MetroWest Daily News