It's curious to me that they are replacing signage on the eastern most portions of I-84, when the signs on the East Hartford to Vernon stretch are objectively older and in worse shape.
Yeah, that doesn't make much sense to me, either. Those from Vernon out to the state line date back to the late 90s and were probably the first generation of Phase IV signs to be put up, as they predate the "service bar". Still, the ones from East Hartford to Vernon (Rt 15 to 30/83) have to be from the 1980s and don't have a target for replacement yet. Maybe, its possible it has to do with the fact that there's highway lighting in the area so the signs are visible that way, while east of Tunnel Rd, its pretty dark and you need good reflective signs. I don't know, just a thought.
What's also interesting is the current project on I-91 from North Haven to Meriden is replacing the same generation of signs being replaced in the I-84 project, while those north of Hartford to the state line date to the 1988-1992 time frame.