Awesome solution, simple genius. So many times I've tried to explain a similar principle for this kind of situation. Signs don't work! People don't read them (a

Awesome solution, simple genius. So many times I've tried to explain a similar principle for this kind of situation. Signs don't work! People don't read them (actually, they often don't even see them, at least consciously). Especially when it's a common action. You generally have to physically alter their path through the task to get their attention -- disrupt the affordances somehow. If you don't want anyone to turn on the oven, cover the knob (or remove it). Same for a door handle. There's one case of something on the shelf that's earmarked for a particular purpose? Tie or tape it in place. A sign works to give reasoning, but first you have to slow down the distracted and goal-oriented person enough to read it. Another good example of this kind of design is circuit breaker lockouts: an electrician needs to work on a particular circuit, so they turn off the breaker. To make sure that no-one turns it on and kills them while they're still working, they bar the switch in place with a physical lock that only they have the key for. Better, some models allow multiple locks to be attached (it's like a physical concurrency semaphore). Then the circuit can't be re-powered until all locks have been removed.