As part of a $95.9 million program to ease traffic congestion on the city's busy streets, 4-by-4-inch sensors will be glued to the pavement on 25 percent of the metered parking spaces this fall. These devices are embedded with a wireless sensor that can determine in real time whether the spaces are occupied or vacant, and transmit the information to city transit offices. The offices, in turn, can send the data to Web sites that drivers can check using smartphones with mobile Internet access.

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