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Recent News and Articles on the Keywords: jam + traffic + solved  Related to the article below (Last Update: 8/5/2008)


Deadspin
Socialism Has Solved Every Traffic Jam In The World
Deadspin, NY - Jul 20, 2008
But you also hate traffic. "Oh God, everyone else driving is such an idiot! If they watched where they were going, I wouldn't be running behind, ...

Ceylon Daily News
Beijing Olympics: One World, One Dream
Ceylon Daily News, Sri Lanka -
The traffic problems are solved. More than 100000 well-trained volunteers are ready to serve. And over 100000 policemen and professional security staff as ...
?NBA Set for Best Conference Ever?
This Day, Nigeria -
Their reasoning was that it was going to cause traffic jam and a chaotic situation, so the project had to be put on hold until we came on board. ...
Traffic jam affects lives
Vail Daily News, CO - Jul 27, 2008
We sat in traffic on the highway for 51 minutes (yes, we timed it in the beginning, ironically, out of amusement). Guessing games ensued as to the cause of ...
Escaping the web of traffic
Daily News & Analysis, India - Jul 31, 2008
?If you are on the Western Express Highway and witness a major traffic jam, you have to manually put a check mark on road jam, one of the options available ...
What Is It Worth?
Russia Profile, Russia - Aug 4, 2008
Ramshackle trucks and sparse Zhigulis and Volgas drag on down this highway in one endless traffic jam; but every year, if not every month, there are more ...
The traffic commentary
The Daily Star, Bangladesh - Jul 27, 2008
... a survey carried out by Democracy Watch, a majority of respondents identified worsening roads and unplanned repairs as the main causes of traffic jams. ...
Straight Talk - Remembering Home
The Nation, Pakistan, Pakistan - Aug 2, 2008
The city's traffic was clogged after rainwater flooded roads, causing traffic jams and gridlocks lasting hours'. As they say here - 'Welcome to the reality ...
Protesters bring traffic to a halt
Northamptonshire Evening Telegraph, UK - Jul 16, 2008
During yesterday's demonstration, protesters handed out leaflets to drivers caught in the jam, explaining their reasons and apologising for the ...
Auto Answers: Duncan Haimerl | Auto Answers
Hartford Courant, United States - Jul 25, 2008
Getting stuck in a traffic jam in the heat of summer or freezing cold of winter must severely affect the range of an all-electric car. ...
Source: Google News

[CITATION] Still Flowing: Approaches to Traffic Flow and Traffic Jam Modeling -
K Nagel, P Wagner, R Woesler - Operations Research, 2003 - INFORMS
... height as ~t -1/2 . Without going through the analytical solution of the ... fronts
smear out; and if one thinks about a jam caused by a traffic light which ...

Cluster effect in initially homogeneous traffic flow -
BS Kerner, P Konh?user - Physical Review E, 1993 - APS
... without obvious reasons [7], a "phantom traffic jam," will be ... appears in the ini-
tially homogeneous traffic flow. ... 8), and (9) has been solved numerically (Figs ...

Traffic jams, granular flow, and soliton selection -
DA Kurtze, DC Hong - Physical Review E, 1995 - APS
... Vries (KdV) equation. The traffic jam can be identified with a soliton solution
of the KdV equation. The perturbation terms select ...

Deterministic spontaneous appearance of traffic jams in slightly inhomogeneous traffic flow -
BS Kerner, P Konh?user, M Schilke - Physical Review E, 1995 - APS
... The algo- rithm of the numerical solution of such a problem has been described in
[3]. B ... Due to such a local breakdown effect, a traffic jam is formed. ...

An analysis of traffic flow
H Greenberg - Operations Research, 1959 - JSTOR
... solved to yield the density dependence of the traffic velocity. Thus u= c In
(kj/k), (13) where c is taken as constant and kj is the density for a traffic jam ( ...

Theory of traffic jam in a one-lane model -
H Hayakawa, K Nakanishi - Physical Review E, 1998 - APS
... As mentioned, to describe the traffic jam formation, however, we should choose the ...
while cubic nonlinear terms can produce the interface solution to connect ...

Improved fluid-dynamic model for vehicular traffic -
D Helbing - Physical Review E, 1995 - APS
... of velocity variance immediately before a traffic jam develops ... include too many
variables to be solved with computers ... to be applicable to on-line traffic control ...

MACROSCOPIC FREEWAY MODEL FOR DENSE TRAFFIC-STOP-START WAVES AND INCIDENT DETECTION
D REINHART - … Ninth International Symposium on Transportation And Traffic …, 1984 - books.google.com
... critical fluctuations occur: fluctuations which are usually rapidly dis- solved
do not ... 4600 s there is a speed breakdown (due to a traffic jam) which after 10 ...

Peak-Load Pricing of a Bottleneck with Traffic Jam -
S Mun - Journal of Urban Economics, 1999 - Elsevier
... car-following theory, the equilibria with traffic ? ... jam hypercongestion in his term
are dynamically unstable ... bending cost function could be solved by defining ...

Stochastic theory of freeway traffic -
R Mahnke, J Kaupu?s - Physical Review E, 1999 - APS
... of probability distribution, showing formation of a jam on a ... of the time-dependent
Master equation solved by the ... of three different regimes of traffic flow, ie ...

Source: Google Scholar

Traffic jam mystery solved by mathematicians

Mathematicians from the University of Exeter have solved the mystery of traffic jams by developing a model to show how major delays occur on our roads, with no apparent cause. Many traffic jams leave drivers baffled as they finally reach the end of a tail-back to find no visible cause for their delay. Now, a team of mathematicians from the Universities of Exeter, Bristol and Budapest, have found the answer and published their findings in leading academic journal Proceedings of the Royal Society.

The team developed a mathematical model to show the impact of unexpected events such as a lorry pulling out of its lane on a dual carriageway. Their model revealed that slowing down below a critical speed when reacting to such an event, a driver would force the car behind to slow down further and the next car back to reduce its speed further still. The result of this is that several miles back, cars would finally grind to a halt, with drivers oblivious to the reason for their delay. The model predicts that this is a very typical scenario on a busy highway (above 15 vehicles per km). The jam moves backwards through the traffic creating a so-called ‘backward travelling wave’, which drivers may encounter many miles upstream, several minutes after it was triggered.

Dr Gábor Orosz of the University of Exeter said: “As many of us prepare to travel long distances to see family and friends over Christmas, we’re likely to experience the frustration of getting stuck in a traffic jam that seems to have no cause. Our model shows that overreaction of a single driver can have enormous impact on the rest of the traffic, leading to massive delays.”

Drivers and policy-makers have not previously known why jams like this occur, though many have put it down to the sheer volume of traffic. While this clearly plays a part in this new theory, the main issue is around the smoothness of traffic flow. According to the model, heavy traffic will not automatically lead to congestion but can be smooth-flowing. This model takes into account the time-delay in drivers’ reactions, which lead to drivers braking more heavily than would have been necessary had they identified and reacted to a problem ahead a second earlier.

Dr Orosz continued: “When you tap your brake, the traffic may come to a full stand-still several miles behind you. It really matters how hard you brake - a slight braking from a driver who has identified a problem early will allow the traffic flow to remain smooth. Heavier braking, usually caused by a driver reacting late to a problem, can affect traffic flow for many miles.”

The research team now plans to develop a model for cars equipped with new electronic devices, which could cut down on over-braking as a result of slow reactions.

 

 

 
 
 
 
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