Does the portion of the former I-95 in the Boston area that follows the Tobin Bridge and the US 1 expressway/Jersey freeway count?
The Tobin and the Northeast Expressway (as far north as Cutler Circle/Route 60) were designated I-95 for a while; but they were never linked to any other part of the Interstate system. At the south, I-95 would have followed the unbuilt Southwest Expressway and part of the Inner Belt. To the north, the Northeast Expressway was supposed to be extended through Lynn and Saugus to meet Route 128. The decision not to build any of those roads was made by Governor Sargent in 1970. It took a few years after that to reroute the I-95 designation around the city of Boston, using Route 128.
I may be wrong, but I don't believe that any signs were posted along the Northeast Expressway to indicate that it was I-95. Certainly none of the big green signs had any I-95 designation. At most there might have been a few I-95 shields posted next to the breakdown lane.
Some maps did show that part of the route as I-95.
At that time, US 1 was still routed via nearby local streets, Broadway in Everett and Malden.