The total number of road bridges presented in this market size post can be broken down by whether these are rural bridges or urban area bridges. Rural bridges make up 74% of the total and urban bridges 26%. According to the source, nearly a quarter of these bridges are in poor shape, defined as either structurally deficient or, more ominously, functionally obsolete.

Geographic reference: United States
Year: 2009
Market size: 601,078 bridges
Source: “Table 1-5: Number of Road Bridges by Functional System: 2009,” State Transportation Statistics 2009, page A-5.
Original source: Research and Innovation Technology Administration, Bureau of Transportation Statistics, U.S. Department of Transportation