The lifespan of a typical transportation structure can vary greatly depending on factors such as the type of structure, materials used, level of maintenance, and environmental conditions. For example, a concrete bridge may have a lifespan of 50-100 years, while a steel bridge may last 75-100 years or more with proper maintenance. Meanwhile, roads and highways typically have a lifespan of 20-30 years before needing significant repairs or replacement. However, these estimates can vary widely depending on various factors and should be assessed on a case-by-case basis.
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