Erik Caldwell, deputy chief operating officer for the city of San Diego (second from left), and David Graham, chief innovation officer for the city of Carlsbad (center), shared the biggest opportunities and obstacles they see in smart city efforts. Photos courtesy of Qualcomm.

Erik Caldwell, deputy chief operating officer for the city of San Diego (second from left), and David Graham, chief innovation officer for the city of Carlsbad (center), shared the biggest opportunities and obstacles they see in smart city efforts. Photos courtesy of Qualcomm.

In the last two years, the city of San Diego has installed 4,200 smart streetlights downtown, equipped with cameras, sensors and microphones...

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