WASHINGTON (AP) — The Associated Press analyzed the federal National Bridge Inventory to focus on the thousands of bridges that have the unfortunate designation of being both “structurally deficient” and “fracture critical” — a combination of red flags that experts say indicates significant disrepair and an increased risk of collapse. Despite the ominous sounding classifications, transportation officials say such bridges are safe, and undergo rigorous inspections.

Here are 10 questions and answers regarding the status of the nation’s bridges:

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