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FHWA Home / Policy & Governmental Affairs / 2002 Conditions and Performance

Conditions and Performance


Status of the Nation's Highways, Bridges, and Transit:
2002 Conditions and Performance Report

Exhibit 11-39:

Year of Construction and Cumulative ADT - Other Superstructure Materials

Exhibit 11-39

Exhibit 11-39 is a bar graph that shows the construction of other superstructure bridges. The vertical axis measures number of bridges from 0 to 1,000 in increments of 100 bridges. The horizontal axis has 21 bars, one for each 5-year period between 1900 and 2000. New "other" material superstructure bridges were at 900 before 1900. The bars fluctuate between 50 and 160 for each period to 1935, then peaked at just under 300 in 1940. The figure dropped below 100 from 1941 to 1975 then rise gradually to 300 by 2000. There are also two lines and a second vertical axis (measuring percentages from 0 to 100 in increments of 10 percent) in this chart. The first, representing cumulative percent of structure population, rises from 25 percent in 1900 to 50 percent in 1930, 60 percent by 1940, 70 by 1975, 85 by 1990, and 100 by 2000. The other line, representing cumulative percentage of ADT, runs the same course as the first line up to 1935, then parallels it to 2000 except at 1 to 10 percentage points lower.
Source: National Bridge Inventory.


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Page last modified on November 7, 2014
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