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Doesn't mean it never happens, but I've never seen anyone ignore the red light which controls access from the rotary to the BU Bridge going towards Boston. I see it fairly often, though, on the Cambridge-bound side -- making the right onto the entrance to Mem Drive.

In fact, technically, since there's no sign to prevent it, turn on red is allowable, at both of those intersections. It would help de-congest the rotary if drivers would use that option, going towards Boston. (But stopping, first, before proceeding, of course.)