We're taking past each other. I'm not saying we can make the world perfectly safe and that humans are never at fault. Rather, that after a mistake or accident

We're taking past each other. I'm not saying we can make the world perfectly safe and that humans are never at fault. Rather, that after a mistake or accident it's not helpful to blame. I'll just quote from OSHA: "The prevention of another future incident is the purpose of incident investigation, not to lay blame or find who’s at fault. The investigation should identify the causes of the incident so that controls can be put in place to prevent the same incident from happening again. [...] For the incident investigation to be effective, management must have a plan in place for implementing the corrective actions and making system improvements." You can blame those drivers for not reading the speed limit all day long, but that doesn't prevent future accidents. That off ramp is poorly designed. That it can't be fixed today for reasons is besides the point. There's still obvious lessons to take away from it when designing new off ramps. One obvious lesson is that signs are not an effective way to slow people down.