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| | Traffic Jam Explanation |
 | | When the cause of a freeway traffic jam, e.g., an accident, a brief stall, a temporarily overcrowded freeway entrance or exit, etc., is removed or is no longer in effect, the jam does not disappear instantaneously. |
 | | The evolving jam moves over the freeway in the direction opposite to traffic, affecting it far from the location of the original cause. |
 | | If the incident happens when traffic is saturated (numbers in the cells equal to 8 in our example), or if it happens inside a queue (numbers greater than 8), the fronts and backs of queue generated by the incident move at the same speed and the queue does not die down. |
| www.ce.berkeley.edu /~daganzo/explain2.html (606 words) |
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