[MrBlueIncognito]

> And yes, sometimes it is important to expect humans to not make mistakes. For example, at railway crossings. Even if you drove over it 100 times and no train came, the 101th time you may still die if you don't check for a train before crossing.

For somebody going through a railway crossing, yes, they shouldn't allow themselves to be prone any mistakes there. However, for the people involved in the construction of the railway crossing, they should certainly expect everyone to screw up and scrutinize the safety. We don't want to leave anything affecting livelihoods to chance.

"On average, each year around 400 people in the European Union and over 300 in the United States are killed in level crossing accidents."

https://en.wikipedia.org/wiki/Level_crossing#Safety