BOSTON — Rebekah Adelstone usually drives to work, which takes 15 minutes. Since record snows have fallen, she has not wanted to risk losing her precious parking spot, so she has taken a bus to the subway. But on Tuesday, after even more snow fell, the subway system was shut down. So she ended up taking two buses to work, and her commute stretched to two hours. Her ordeal was typical of many residents, who soldiered through the more than six feet of snow that has piled up in the last 17 days. With no chance to melt, the snows...