The world’s smartest cities include Singapore, New York, and …

The world’s smartest cities in terms of technology sensing infrastructure include Singapore, New York, Barcelona, Oslo, London, and San Francisco, according to Unacast’s Latest Proximity.directory Report (Formerly Proxbook).

The new Q4 2016 report chronicles the cities that have deployed Proximity Sensors, or the sensors that detect things like whether a car is parked on a parking spot. The report has aggregated data from more than 370 Proximity Solution Providers in over 50 different countries.

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“The Q4 2016 proximity.directory Report concluded the deployment of global smart technology projects in urban markets is expected to grow significantly on annualized basis,” said Thomas Walle, cofounder and CEO of Unacast, in a statement. “We are still in the early stages of smart city developments. In 2017, big project announcements will come to life.”

Between 2014 and 2016, the global smart city technology market increased by $3.3 billion, going from $8.8 billion to $12.1 billion. An estimated  66 percent of the world population will live in urban areas by 2050. Today, 82.3 percent of the population in the U.S. live in urban areas.

Walle continued, “As more of the world’s cities become congested with continued urbanization, governments need to prepare for smart city initiatives. These initiatives can benefit by using proximity technologies to overcome mobility challenges the growing population presents to ensure public safety, optimize traffic flow, create better tourism experiences, and data monetization opportunities.”

Here’s how cities are getting smart and putting technology to work for them.

The report said Singapore deployed a massive amount of sensors and cameras around the city to analyze traffic congestion and crowd density, enabling government and officials to reroute buses at rush hour, avert traffic jams. They are able to predict how new buildings may affect wind patterns or communication signals.

Barcelona installed wireless light-emitting diode (LED) street lights to reduce energy usage. It has also deployed a network of ground sensors to regulate irrigation relative to forecasted rainfall estimates and temperature. The sensors adjust the city’s sprinkler system and fountains for efficiency, leading to an increase in water conservation by 25 percent—saving the city $555,000 per year.

New York City has begun implementing a high-speed broadband service for the entire city which will be completed by 2025. Within this area, officials will be able to monitor data on air quality, traffic, and energy consumption.

London is using technology to help tackle congestion and make parking simpler. Government officials have opened up data to start-ups and projects to take advantage of it in building their products.

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And San Francisco has implemented a smart parking system to monitor occupancy and can use this data for a dynamic parking system that adjust the cost of parking based on whether spots are occupied or vacant.

The world is sensored up further, now with a total of 13,074,000 sensors. Of those, 8,039,500 are beacons, 2,113,000 are near-field communications (NFC) sensors, and 2.92 million are Wi-Fi points.