Indeed, thick layers of caked mud carved up the streets on Saturday, evidence of the rushing water's movement down the hill and into Lake Superior, and some roads were simply missing.
As satellite-based GPS becomes more ubiquitous in cell phones, the idea is that by figuring out the position and speed of a person's cell phone as it travels in a moving car, traffic data could be made available faster, cheaper, and in areas where it's hard to measure, like on rural roads or city streets, for example.