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PaulitoTuGato t1_isq45w2 wrote

It’s so that the water moves off the sidewalk and into the street where they have drainage next to the curb. The street also pitches down from the center towards the curb. Although it might not seem great when it gets really cold, when properly cleaned and salted it definitely helps in drying the sidewalk. Watch out for anything metal on the sidewalk, I’ve almost busted my ass a few times walking on metal lids in the winter!