Signs without an audience

Who is this sign for? Someone that’s likely to run up or down the stairs at a train station – a place where people tend to rush and run – but someone that’s also going to read and take heed of a coddling health and safety sign:

A warning sign featuring a warning triangle with an exclamation mark inside, next to text saying "take care do not run on the stairs". The sign is at the top of a set of stairs next to the handrail

Would love to know the story behind it. Who said it was needed. Who they thought it was for. What risks exist without it, and what stats exist to suggest it will help.