Living in another crowded city, Hong Kong, perhaps I can offer some perspective: We have tons of elevated tools highways and bypasses aimed at reducing traffic, the problem is all these elevated roads needs to go around a lot of tall buildings. Going underground with subway already provides us with better solution to a lot more of our traffic problem. What the boring company's proposing isn't all that different from the subway solution (we already have subway going three or four level deep), it simply allows cars to transported via subway.