Currently, I-95 runs through Wilmington, Delaware and I-495 bypasses the city to the east (as God intended it to be).
The consequence is that thru traffic goes through the midst of the city, causing traffic jams (the highway there is depressed, with a 2-2 carriageway). Relatively little traffic takes the bypass.
There is movement afoot to switch the highway designations, so that I-495 runs through the city and I-95 is the bypass.
A I-xNN highway through town while a I-NN bypasses it? It's the apocalypse, I say!
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Da DOK