As long as any vehicle (except, like, airplanes) can pass over the bridge, it does not count as destroyed. If the bridge is destroyed but successfully repaired before 1/1/24 so that vehicles can cross it again, it does not count as destroyed.

This is question #6 in the Astral Codex Ten 2023 Prediction Contest. The contest rules and full list of questions are available here. Market will resolve according to Scott Alexander’s judgment, as given through future posts on Astral Codex Ten.