The city of San Francisco is a very interesting experiments. In fact, they used their parking meters 6000-24000 a system for motorists to check whether their phones to a place near the place where they are located. Because the driver looks at a map of all sites and the free parking spaces are clearly indicated.
The experiment, the installation of sensors 6000 presence in these places. I find this fabulous idea, hoping that this ideas in the mayors of our cities.
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