Do look at the "Studies" section of the same article, too.[1] It is far from established that induced demand outweighs the capacity increase from road construction.
Mayors of big towns are clearing city centers from cars and making them walkable again anyways (at least in Europe, I don’t know how it is being done in other places). If tunnels are the shortest path to get from one part of the city to another (like in Zurich), cars will use them.