Seattle in fact has an 8k charity run titled "Beat the Bridge," where racers must cross the University Bridge before a pre-determined time in order to let through maritime traffic.
I'm envisioning racers who didn't finish the run in time tumbling down either side of the bridge as it opens to let boats through.
When I first heard a description of this show, I imagined trap doors that contestants fell through if they stepped on a wrong answer (à la
Squid Game). A video floor four feet off the ground doesn't quite match what my imagination conjured.