There is no relevant information in the search results regarding the exact number of bridges in the world.

Key Insights

• Flood Impact on Bridges: In underdeveloped nations, inadequate technology exacerbates the damage caused by floods to bridges, highlighting the need for smart bridge solutions that can monitor and react to environmental conditions
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• Carbon Emissions: The construction of bridges, particularly long-span ones, is a significant contributor to global carbon emissions, necessitating strategies to reduce these emissions in future projects
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• Military Bridging Systems: The design of military bridges is evolving to meet the demands of rapid deployment and versatility, which also makes them suitable for civilian use in disaster scenarios
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• Concrete Arch Bridges in China: China has made significant advancements in the construction of concrete arch bridges, providing valuable insights for global bridge engineering
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• Aging Infrastructure: Many bridges worldwide are aging, requiring innovative monitoring and maintenance strategies to ensure their safety and functionality
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Conclusion

While the search results do not provide the exact number of bridges globally, they highlight the importance of addressing the challenges posed by aging infrastructure, environmental impacts, and the need for innovative solutions in bridge construction and maintenance.