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AI reduces traffic-related carbon emissions in Buenos Aires

Amy Booth

They may not be aware of it, but a small change made using artificial intelligence (AI), since October, has resulted in fewer stops.

Traffic officials in the city adjusted the cycle of traffic lights at Tronador street to match that on Melian Avenue four blocks north, and staggered their cycles between the two.

This adjustment was suggested by Green Light, an AI-driven Google Maps project that makes smart recommendations for optimizing traffic flow.

This reduces the air pollution and carbon emissions associated with stop-start driving.

According to the Buenos Aires City Government, this has resulted in drivers making 14% fewer stoppages, saving 2,339 travel hours and 6,987 liters per year.

In a 2016 study published in Environmental Science: Processes & Impacts, pollution at stoplights was found to be up 29 times greater than that in traffic moving freely.

Google explained that making AI-based traffic light cycle recommendations is a great way to reduce carbon emissions, as dozens cities aim to achieve net zero emissions of greenhouse gases by 2030.

Green Light has been installed at over 70 intersections. "Early numbers suggest that we could reduce intersection emissions by as much as 10% and stop rates by 30%," said Kate Brandt, Google’s chief sustainability officer in 2023.

Since 2021, the Green Light Project has been implemented in seventeen cities including Rio de Janeiro and the Indian cities Kolkata and Bengaluru. Abu Dhabi, Manchester and Boston, U.S.A. are also included.

Matheus vervloet is Green Light's Product Manager. He says that each location has its own challenges.

Vervloet stated that in India, the police is responsible for traffic management.

You will see more hierarchical decision making. You can see hierarchical decision-making.

He added that in Germany, the project could face delays due to internal bureaucracy.

He said, "They have to go through more procedures before they can make changes." "In other nations, it is quicker."

SAVING SECONDS

Changes can be minute. They may involve a slight adjustment of traffic light timings.

In a network as complex as city traffic patterns, large adjustments like changing the cycle of a traffic signal from 30 seconds to 90 can have unintended effects. Vervloet explained that drivers may alter their routes and the stoplights Google analyzes will become irrelevant.

He said that if you make a small adjustment, it's unlikely you will see a significant change in your behavior.

Skeptics say that even the most optimized intelligent stoplight systems still focus on drivers' attitudes and behaviors.

Laura Ziliani is an independent urbanism and transport consultant who was previously based in Buenos Aires. She said that measures taken to prevent cars from having to stop have the opposite impact: they encourage people drive more.

She believes that cities should implement measures to discourage driving, such as implementing slower speed limits or higher road tolls.

Buenos Aires builds more public transportation. The Mayor of Buenos Aires, Jorge Macri, recently announced plans to build a new metro line. A new electric bus began operation in May.

According to Pablo Bereciartua of the Buenos Aires City Government, many people come from suburbs that are far outside city limits.

"Any large city -- New York City, Madrid, Paris or London -- has a metropolitan railway system that is proportionally more efficient than Buenos Aires. He said that they transport more passengers and work better.

He added, "Those people do not use their own cars as they arrive by train."

He argues that a large proportion of commuters is limited to driving, and that projects like Green Light can reduce the environmental impact.

Bereciartua reports that Buenos Aires officials want to use Green Light technology and other smart stoplights along more major roads in the city.

He noted that this task is difficult because the routes to the other side are under the jurisdiction of the Province of Buenos Aires.

Vervloet stated that cities need to continue to develop their infrastructure for public transport and cycling to reduce emissions.

Green Light, he added, is an alternative that's low-cost. Green Light is available for free to cities and does not require the installation of sensors or other equipment.

He said that in 10 years, Green Light might not be needed.

(source: Reuters)