They are hydraulic elevators. Failure falls are slow. There are exclusion zones under the bridge, and soneone inside would have to trip, fall, and hit their h

They are hydraulic elevators. Failure falls are slow. There are exclusion zones under the bridge, and soneone inside would have to trip, fall, and hit their head to be at serious risk. Basically, failure modes for aviation related technology tries to take into account public risk.