An app that helps drivers avoid red traffic signals

Updated 18 September 2012
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An app that helps drivers avoid red traffic signals

Researchers at the Massachusetts Institute of Technology have developed a system that uses dashboard-mounted smartphones to help drivers avoid red lights and reduce fuel consumption.
The app called SignalGuru predicts when a traffic signal is about to change, and the speed that should be driven when approaching an intersection in order to cruise through without stopping.
“The stop-and-go pattern that traffic signals create increases fuel consumption significantly,” said Emmanouil Koukoumidis, the scientist behind the app.
“We wondered how we could help drivers cruise through signal light intersections without stopping, and how much we could save on gas and improve the flow of vehicles,” he added. When approaching an intersection, the camera on a driver’s dashboard-mounted smart phone is activated, which detects when a signal transitions from red to green and vice versa.
Using this information, the app determines the speed that should be driven to avoid stopping at a red light on the cusp of turning green, or a green light just shy of turning red.
“It tells the drivers that ‘if you drive at 30 miles per hour then you’ll be able to cruise through without stopping,’” explained Koukoumidis, adding that the speed recommended is always within legal speed limits.
Information on the traffic signals, such as when they change, is crowdsourced by other users of the app and then sent back to SignalGuru to improve the accuracy of its predictions. Koukoumidis said that while testing their prototype in Cambridge, Massachusetts they saw a 20 percent decrease in fuel consumption, which could have a significant monetary and environmental impact.
“In the USwe’re spending 1/3 of the annual energy consumption for transportation and a big part of that is vehicles,” he explained. The system was also tested in Singapore, where the traffic lights vary depending on the volume of traffic.
“It was less accurate compared to Cambridge where signals were pre-timed and had fixed settings but it would still work reasonably well with predictions accurate within two seconds,” Koukoumidis said.


Crowdsourcing information about signal lights is necessary, he said, because this data is difficult to access from traffic authorities, which are not unified and do not always have the information computerized.
But this could also pose safety concerns, for example, a signal not changing when predicted due to inaccuracies.
“SignalGuru will advise the driver when to arrive at the intersection but the driver should always check for himself that the light indeed turned green,” he said, noting that it’s similar to how a driver does not follow a navigation device blindly.
Currently the group is looking for industrial partners to commercialize the software. They also plan to implement other safety features, such as thresholds on deceleration, before making it accessible to the public.
Koukoumidis said that going forward their patented approach could also be used to capture other information about the real world, such as available parking spaces or real-time gas prices.
” are computer eyes looking out into the street that can capture all sorts of information,” he said.
The research project was launched as part of the Singapore-MIT Alliance for Research and Technology’s Future Urban Mobility group, in which professors Margaret Mantonosi and Li-Shiuan Peh were advisers.


Book Review: Rebuilding shattered Aleppo armed with faith and hope

Philip Mansel’s book “Aleppo: The Rise and Fall of Syria’s great Merchant city,” has been updated and is also available in paperback. (Shutterstock)
Updated 21 February 2019
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Book Review: Rebuilding shattered Aleppo armed with faith and hope

BEIRUT: Aleppo, one of the oldest continuously inhabited cities in the world and once a model of coexistence, is now a mesh of rubble and shattered lives. 
Philip Mansel’s book “Aleppo: The Rise and Fall of Syria’s great Merchant city,” has been updated and is also available in paperback.
An eminent specialist of the Levant, Mansel attempts in the first part of his book to explain how harmony gave way to an implacable cataclysm. In the second part, the author has carefully selected a collection of travel writings on Aleppo from the 16th century to the 21st century. 
The ruthless and pitiless destruction of Aleppo shows the vulnerability of cities. Mansel believes that cosmopolitanism, literally meaning cosmos (world) in a city (polis), is an elusive concept. When politics and economics go wrong, rules are broken, and anything can happen even in a city like Aleppo. 

The author focuses on Aleppo’s history since the Ottoman Empire. The people of Aleppo, angered by the Mamluk excessive taxation, welcomed their defeat by the Ottoman army. Aleppo remained loyal to the Ottoman rule for 400 years and became one of the most important trading centers in the Levant. 
Caravans from India, Iran, the Gulf and the Arabian Peninsula passed through the city on their way to Iskenderun, Smyrna, and Constantinople. Already, in 1550, a French diplomat claimed that Aleppo was the most important commercial center of the Levant.
A century later, Aleppo was still trading with the Ottoman Empire and although its external trade with foreign countries was diminishing, its multiracial and multireligious population lived peacefully. Even during the French Mandate (1923-1946), the cosmopolitan population of Aleppo was united against the French.
Syria’s independence granted by France on Jan. 1, 1944, was followed by the proclamation of the State of Israel on May 14, 1948, triggering the departure of Aleppo’s Jewish population.
The subsequent establishment of the Assad regime caused a political and economic rift in the country, and particularly in Aleppo, with the affluent west and the impoverished east brutally attacked and decimated by Syrian and Russian armed forces with the help of Iranian soldiers, Lebanese and Kurdish militias.
While emigrants are preserving the memory of Aleppo in cities around the world, some inhabitants of East Aleppo are returning.
Destroyed but alive, destitute but armed with faith and hope, they embody the quality of those who have contributed to make Aleppo one of the most beautiful cities in the world. They are determined to rebuild knowing that their shattered lives remain the hardest to repair.