Why have the Flamingo pedestrian bridges been closed on the Las Vegas Strip?

Pedestrian bridges at Flamingo Road on the Las Vegas Strip have closed due to Formula 1 construction. Work in the resort corridor will continue over the next few weeks. The closures are part of preparations for the upcoming racing event.
We're now firmly in Formula 1 construction season here in Las Vegas, so here's an update on some work you need to look out for in and around the resort corridor over the next few weeks, plus an answer as to why some pedestrian bridges have been closed on the Strip recently.
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