Once upon a time my commute was Chepstow to Bristol, over the Severn Bridge. Before the new bridge opened, the threshold for closing the original bridge to all traffic due to wind conditions was very high. Indeed, the first time it happened was in 1986, 20 years after opening. On such days you wouldn't want to be out there under any circumstances.
Once the new bridge was in place, for many years the original would routinely be closed in conditions that would previously have prompted a closure to high-sided vehicles only, in the mistaken belief that the new bridge was an acceptable alternative. I think the threshold was a certain number of gusts above 40 knots, or a single gust over a higher limit. To be reopened there had to be a set period without a gust over 30 knots.
You might think that by the time they'd actually closed the bridge, any supposed danger could well have passed, and you'd be right!
Fortunately, the police had jurisdiction over the main carriageways only, not the cycle tracks. So frequently, barring a long drive or an awkward train journey, my only practical option was to cycle over the closed bridge, and I did so many times.