(MSNBC) - The following state bridges carry at least 10,000 vehicles a day and have been rated as either structurally deficient or functionally obsolete by inspectors, according to an MSNBC.com analysis of the National Bridge Inventory.
A structurally deficient bridge is closed or restricted to light vehicles because of its deteriorated structural components. While not necessarily unsafe, these bridges must have limits for speed and weight.
A functionally obsolete bridge has older design features and, while it is not unsafe for all vehicles, it cannot safely accommodate current traffic volumes, and vehicle sizes and weights.
Keys to using the data below:
Status of "D" means the bridge has been rated structurally deficient; "O" means it has been rated functionally obsolete. More details below the table.
Keys to using the data above:
Status of "D" means the bridge has been rated structurally deficient; "O" means it has been rated functionally obsolete.
Sufficiency rating is a value obtained by calculating four separate factors (structural adequacy and safety, serviceability and functional obsolescence, essentiality for public use, and special reductions) that is indicative of a bridge's sufficiency to remain in service. A value of 100 represents an entirely sufficient bridge and a zero represents a deficient bridge.
The raw dataset of the National Bridge Inventory, which is compiled by the U.S. Department of Transportation's Federal Highway Administration from state reports, used for analysis was provided to MSNBC.com by the National Institute for Computer-Assisted Reporting at the University of Missouri. The most recent data includes inspections through December 2006.
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