In fact, the ideas is thousands of years old. The ancient Romans had a concept of raised crosswalks in Pompeii: > Blocks raised on the road allowed pedestrians

In fact, the ideas is thousands of years old. The ancient Romans had a concept of raised crosswalks in Pompeii: > Blocks raised on the road allowed pedestrians to cross the street without having to step onto the road itself which doubled up as Pompeii's drainage and sewage disposal system. The spaces between the blocks allowed horse-drawn carts to pass along the road. https://en.wikipedia.org/wiki/Pedestrian_crossing#History https://en.wikipedia.org/wiki/Pedestrian_crossing#History