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 |
5 / 5 (2) |
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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 ...
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Engineers help secure California highways and roads
4 hours ago |
not rated yet |
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Sprays of dirt flew out of a soil box that held a retaining wall as it violently shook from a simulated 7.4 magnitude earthquake. The wall was put to test recently by engineers at the UC San Diego Englekirk ...
Species distribution models are of only limited value for predicting future mammal distributions
9 hours ago |
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Species distribution models are of only limited use in predicting the future distribution of mammals. This is the finding of a study of the climate niches of 140 indigenous European mammals.
Google tests new phone to profit from mobile Web
Electronics / Consumer & Gadgets
Dec 14, 2009 |
1 / 5 (1) |
2
(AP) -- Google Inc. is determined to gain more influence over how the Web is used on mobile phones, even if the next step in the quest tramples some of the relationships forged during its two-year expansion ...
Air Force grant to tighten online encryption
Technology / Computer Sciences
Dec 14, 2009 |
4 / 5 (1) |
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(PhysOrg.com) -- Computer scientist Rafael Pass is seeking new approaches to cryptographic security with a $600,000, five-year grant from the Air Force Office of Scientific Research.
Ethanol results in higher ozone concentrations than gasoline, researchers say
Dec 14, 2009 |
4.3 / 5 (7) |
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(PhysOrg.com) -- Ethanol, often promoted as a clean-burning, renewable fuel that could help wean the nation from oil, would likely worsen health problems caused by ozone, compared with gasoline, especially ...
World's mayors tackle climate change on their own
Dec 14, 2009 |
1 / 5 (1) |
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(AP) -- It isn't easy getting Italy's city dwellers out of their Fiats, off their Vespa scooters and onto bicycles to ride to work, "like here in Copenhagen," says an Italian environmental official.
Antarctic nations plan tough new shipping controls
Dec 12, 2009 |
5 / 5 (8) |
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(AP) -- Countries that manage Antarctica plan tough new controls on ships visiting the southern oceans and the fuels they use to reduce the threat of human and environmental disasters as tourist numbers rise, ...
eBay Mind Games
Medicine & Health / Psychology & Psychiatry
Dec 11, 2009 |
2.7 / 5 (3) |
3
Psychologists have long known that when two people haggle over a price, it pays for the seller to start high.
Europe's flora is becoming impoverished
Dec 11, 2009 |
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1
With increasing species richness, due to more plant introductions than extinctions, plant communities of many European regions are becoming more homogeneous. The same species are occurring more frequently, ...
More 20 mph zones in London would prevent 100 killed or seriously injured casualties each year
Dec 11, 2009 |
5 / 5 (2) |
1
20 mph traffic speed zones reduce casualties by 41.9% with the greatest reduction in child casualties, according to research published today in the British Medical Journal.
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