We need resilient systems that fall back to sanity when broken / discriminating. And not whatever.
Anyone that works with escalators would never go up a broken escalators.
Why?
If any of the stairs are damaged and cannot stay attached correctly, there is a chance of falling into the machinery below, which will not stop just because a human is in the way.
If the failure is in the braking system, it can quickly turn into rapidly moving stairs, which can be very lethal.
Most escalators have multiple independent braking systems so that this doesn’t happen, but some poorly maintained escalators have been discovered with 2 or even all 3 systems disabled.
There are a number of videos online of escalators breaking and going down at high speed.
“An escalator can never break: it can only become stairs. You should never see an Escalator Temporarily Out Of Order sign, just Escalator Temporarily Stairs. Sorry for the convenience.” – Mitch Hedberg
In software, it’s important to think about whether you should fail open or fail shut.
Or it become a trap door:
https://www.youtube.com/watch?v=uQmNfsNQjCgMostly true, until the brakes fail and it turns into a slide XD





