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| | Estimating the External Costs of Driving in San Francisco (Site not responding. Last check: 2007-10-20) |
 | | These costs are known as "external costs" or "externalities." Significant externalities include deaths and illnesses due to air pollution caused by vehicles; traffic congestion that causes lost time and wasted fuel; deaths and damages due to accidents; and the costs to government to provide road construction, maintenance, police, ambulances, street lighting, traffic signals, and more. |
 | | Because this time cost is borne by other drivers, not the decisionmaker, this cost is external to the individual's decision to drive. |
 | | The external costs associated with congestion can be estimated by calculating the total time lost and the additional fuel cost due to congestion in San Francisco and placing a value on that time and fuel. |
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