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A2 and A12 as part of the ring around Utrecht.
A2 around Eindhoven
The A16 as part of the ring around Rotterdam.(Also the merging of the A15 and A16 around Ridderkerk)
A2 around ‘s Hertogenbosch
Also the A4 between the intersections with the A13 and A12 in The Hague, though this is more high capacity weaving.
I don’t know much about other countries except for the 401. In the Netherlands we are now building lots of compareable pieces of expressway around the bigger cities, all based on the model of the 401.
Edit: The new Jersey Turnpike is also parallel, but both roads are connected to all interchanges.