Earlier quoted context omitted.
It's already true in many places, in a lot of European cities you see a sign like this when entering: https://lsmlomza.pl/pliki/2014/03/lsm-znak1.jpg And it basically means that pedestrians have an absolute priority before cars, they can walk on the street as much as they like and you as a driver have to exhibit some extreme attention because if anything happens, it's 99% certain you will be found at fault.
Is that sign real? It is awful design. The meaning is complete obscure to me.
The picture is an adult and child playing on the street. This street is for adults and children to play in.
In practise, in countries where it's less common it will have a text description, and you'd then recognize it abroad even when you don't understand the text: http://www.highwaycodeuk.co.uk/uploads/3/2/9/2/3292309/publi...
Circular blue must be done. Pedestrians must use this path: https://media.istockphoto.com/photos/footway-sign-picture-id...
Red-bordered circles forbid something: https://thumbs.dreamstime.com/b/no-pedestrians-road-sign-253...
And red-bordered triangels warn of something: https://upload.wikimedia.org/wikipedia/commons/0/0a/Singapor...
You should now understand all the road signs used outside the USA and Australia :-)