This may sound like a stupid question, but why are there no such things as stupid questions?
"Why are apples red?" is not a stupid question. "Why do apples exist?" is not a stupid question.
That said, is it stupid to ask why my street is a Himalayan snow-clogged goat path with one-side-only parking, but the freeways are as wide and dry as the desert in July?
Possible reasons:
No. 1: At night, enormous dragons fly the length of 35W and scour it with their fiery breath.
No. 2: The highway was plowed quickly with professional care, knowing that the free flow of traffic required the job to be done in the best way possible.
I'm going with dragons.
I wonder where they're kept. Probably in big barns in the suburbs. Probably the northern burbs. You wouldn't want them anywhere near the airport. Or maybe you would house the municipal dragons by the airport, because people who live around there are used to loud things flying overhead and think nothing of it. If they hear a dragon at 5 a.m., they figure it's FedEx.