Traffic congestion
hideTraffic congestion is a condition on networks that occurs as use increases, and is characterized by slower speeds, longer trip times, and increased queueing. The most common example is the physical use of roads by vehicles. When traffic demand is great enough that the interaction between vehicles slows the speed of the traffic stream, congestion is incurred. As demand approaches the capacity of a road (or of the intersections along the road), extreme traffic congestion sets in. When vehicles are fully stopped for periods of time, this is colloquially known as a traffic jam.
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News tagged with traffic jams
Going vertical: Fleeing tsunamis by moving up, not out
Space & Earth / Earth Sciences
Dec 14, 2009 |
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(PhysOrg.com) -- In the minutes after a strong earthquake struck offshore of the Indonesian city of Padang on Sept. 30, fears of a tsunami prompted hundreds of thousands of residents to evacuate the coastal ...
Beijing vehicles exceed four million: state media
Dec 19, 2009 |
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The number of registered vehicles in Beijing topped four million this week, state media reported, meaning a quarter of the 16 million permanent residents in China's capital have a car.
Optimized by Evolution, Ants Don't Have Traffic Jams
Mar 30, 2009 |
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(PhysOrg.com) -- As highway traffic increases, you'd probably expect a traffic jam, where vehicles slow down due to the high density. While traffic jams are a common occurrence on our highways, high density ...
Netherlands to levy 'green' road tax by the kilometre
Nov 13, 2009 |
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The Dutch government said Friday it wants to introduce a "green" road tax by the kilometre from 2012 aimed at cutting carbon dioxide emissions by 10 percent and halving congestion.
Are Magnetically Levitating 'Sky Pods' the Future of Travel?
Sep 23, 2009 |
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(PhysOrg.com) -- As a society, we are increasingly interested in finding new ways of transportation that are cleaner for the environment. New concepts in mass transit seem to be one of the main ways to move ...
Of traffic jams, beach sands and the zero-temperature jamming transition
May 13, 2009 |
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Researchers in condensed matter physics at the University of Pennsylvania and the University of Chicago have created an experimental and computer model to study how jamming, the physical process in which collections of particles ...
MIT takes aim at ‘phantom’ traffic jams
Jun 09, 2009 |
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(PhysOrg.com) -- Countless hours are lost in traffic jams every year. Most frustrating of all are those jams with no apparent cause — no accident, no stalled vehicle, no lanes closed for construction.
Traffic jams follow explosive pattern, says researcher (w/Video)
Technology / Computer Sciences
Jun 05, 2009 |
4 / 5 (3) |
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(PhysOrg.com) -- Picture this next time you're stuck in traffic: Thousands of wildebeests loping across the Serengeti Plain when suddenly a few spooked animals turn the orderly migration into a sea of locked ...
Googlefail! The Web reacts to virtual traffic jam
May 20, 2009 |
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What would life be like without Google? Last week 83 million people found out.
Defectors take the car, cooperators go by bus
Feb 03, 2009 |
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National economies are driven by the automobile, even during an economic downturn. Every day, hundreds of millions of people take their cars to visit remote places, to commute, and to reach the supermarket.
On the road to secure car-to-car communications
Technology / Computer Sciences
Sep 14, 2009 |
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(PhysOrg.com) -- A European research project works out how to keep car-to-car data transmissions private and secure from malicious hackers.
States send mixed message on texting and driving
Sep 18, 2009 |
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(AP) -- Fiddling with your iPhone behind the wheel can get you fined across much of the nation. But many states are more than happy to tweet you with up-to-the-minute directions on how to steer clear of a ...
Organic traffic lights
Jun 30, 2009 |
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Controlling road traffic in congested areas is difficult to say the least, a point to which any drive-time urban commuter might testify. An organic approach to traffic lights, might help solve the problem and avoid traffic ...
Cooperative forces boost collective mobility of cells
May 06, 2009 |
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An article by Dr. Xavier Trepat, senior researcher of the Cellular and respiratory biomechanics group at the University of Barcelona, Spain, contributes for the first time an experimental answer to the question ...
Rice report shows lessons from Hurricane Rita not practiced during Ike
Other Sciences / Social Sciences
Mar 13, 2009 |
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A new Rice University report released yesterday, exactly six months after Hurricane Ike slammed the Texas Gulf Coast, suggests that people did not practice the lessons learned from Hurricane Rita.
