Traffic jams are common in heavily populated areas.
Traffic congestion occurs when the volume of traffic on a roadway is high enough to be detrimental to its performance. In congested conditions, vehicles speeds are reduced increasing drive times. These conditions are also more taxing for drivers, and automobile accidents may be more frequent. Furthermore, vehicles burn unnecessary fuel when stuck at idle. A period of extreme traffic congestion is known as a traffic jam.
In the United States, construction of new highway capacity has not kept pace with population increases and the resulting increase in demand for highway travel. Between 1980 and 1999, road miles of highways increased by only 1.5 percent, while vehicle miles of travel there increased 76 percent.
The Texas Transportation Institute estimates that in 2000 the 75 largest metropolitan areas experienced 3.6 billion vehicle-hours of delay, resulting in 5.7 billion gallons (21.6 billion liters) in wasted fuel and $67.5 billion in lost productivity. Traffic congestion is increasing in major cities, and delays are becoming more frequent in smaller cities and rural areas.
The five areas in the United States with the highest congestion are:
Los Angeles
Washington, DC
Miami-Hialeah
Chicago
San Francisco-Oakland
Due to dramatic population increases, San Diego and Las Vegas have seen their congestion levels increase by more than 50 percent since 1982.
Trafficjams are common in heavily populated areas.
Traffic engineers apply the rules of fluid dynamics to traffic flow, likening it to the flow of a fluid in a pipe.
Traffic bottlenecks often occur where land is at a premium, so limited parking space is normally correlated with limited road capacity, for example in city centers.
That ghost can last as long as traffic is heavy enough to keep piling on cars at the back end of the chain, even though nothing prevents those at the front ("downstream") from zooming up to speed again.
Had traffic been lighter when the woman in the Buick touched her brakes, the man behind her might not have been following so closely and might not have needed to slow down at all.
trafficjam," breathe slowly from your diaphragm and repeat this musical word engineers use for the condition you're in.
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