pheong - I lived in Illinois for many years before moving here, and I wondered the same thing. I was told that because the type of precipitation that is the biggest problem here is rain and not snow, roads are domed in the center for more rapid runoff. The next time I got in the car I looked at the roads and couldn’t believe I hadn’t seen it before. On my street the center is a good 5 inches higher than the edges. Roads in the Midwest were dead flat, which works better with the snow plow blade.
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