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For most people, checking the weather before setting off for work in the morning is simply a matter of switching on the radio or television, looking at a thermometer, or just sticking a nose out of the window. Determining the extent to which traffic congestion will delay that journey is, however, less straightforward. Radio and television reports normally provide only a general outline of which roads are running smoothly. Looking out of the window will not help much. And even those broadcasters who are able to afford helicopters to spy on the rush-hour cannot easily quantify their observations in the ways that meteorologists are able to do with rainfall, wind-speed and temperature.
[2] What is needed, according to John Leonard of Georgia Institute of Technology in Atlanta, is a way of specifying traffic congestion with greater precision. He thinks he has one. Conditions on the roads, he suggests, should be expressed in terms of traffic “temperature”.

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