| > There was a Big Red Button acting as a physical power cut-out. > Request was to remove the physical button and rely only on a software (touch screen). Death was a remote harm, but moderate injury / user stuck in device / panic attack was plausible. Good on you for not removing it. I work sometimes in mineral processing (above ground | below ground) with conveyor belts, crushers, etc. Big easy physical power cutouts are everywhere: Conveyors have "rip cords" running alongside, pull them and you can stop a 30 tonne/hour conveyor maybe before someone drawn into the rollers is crushed to death or maimed. Crushers | screens | most big equipment has single OFF knife switch with "gang plates" that take multiple padlocks - if you and two others work inside a crusher you each put a lock (three in total) through the gang plates and nobody gets to restart the machin until everybody is out and has removed their padlock. Big physical switches save lives. |