We now see a wide variety of floor signage. In Singapore, there is a yellow-painted footstep on the right side of the paved road at the Marina Bay. Since this road is crowded by runners, this signage probably helps them run on the right side of the road.
In Shenzhen, China, there are orange-colored lines at the subway stations. Since many people are in a hurry, these lines help them not to rush forward when the train is coming, and wait for the next train if they cannot get on.
Although floor signage is visually salient, I wonder whether this is needed to change our behavior, because we learn rules naturally. We learn how to avoid bumping into other runners when running on a narrow road and we also learn how to navigate a huge crowd to get on a train. Although I am a strong supporter of behavior economics and nudge, I believe some nudges interfere with learning. Not surprisingly, some people argue that behavioral economics are not always as effective as thought (Why nudges hardly help)(The dark side of nudging). We need to study more about which specific nudges are ineffective and how we can modify these nudges.