The use of flowerpots is a clear example of what is called “a soft pedestrianization”. Soft because its impact is low, does not require complex constructions and the cost is minimum. Moreover, it allows bikes to cross between them always having in mind that pedestrians should be respected in these pedestrian areas. By respecting them I mean biking at low speed and letting them be. Otherwise the cohabitation is difficult. Moreover, think about the pyramid I proposed some time ago.
We have seen its use in several cities like in the photos bellow.