So a key rebuttal to the tunnels is that if you add one layer of tunnels, that will simply alleviate congestion, it will get used up, and then you'll be back where you started, back with congestion.
Glavni argument protiv tunela jest da ako dodamo jednu razinu tunela, to će samo rasteretiti gužvu i bit će potpuno iskorišten, a onda ćemo opet biti na početku, s problemom prometne zagušenosti.