Shared Streets, also called Shared Space, or Shared Surface, is a theory relating to the organization of traffic consisting of eliminating the traditional separation between cars, pedestrians and other users. The objective is to improve road safety by forcing users to interact with other people as they travel through shared areas, traveling at appropriate speeds and with sufficient consideration for others. The term shared space was coined by Ben Hamilton-Baillie") in 2003 and introduced and adapted into Spanish as Calles Compartidas in a manual published by dérive lab in 2015.

This conception is based on the observation that the behavior of individuals in traffic improves in a shared public space; This traffic organization dispenses with conventional traffic control devices (signals, signs, lines, etc.) and other complex regulations. This concept was designed and promoted by Hans Monderman.

Shared Space is also the name of a European project (within the interregional program IIIB-MAR-DEL-NORTE) that develops new policy and methods for the design of public spaces.[1] Hans Monderman was the head of the project until his death in 2008.

Safety, congestion, and economic vitality can be solved if streets and other public spaces are designed and managed to allow traffic to integrate with human activities, not segregating traffic from people. A main characteristic of a street designed according to this philosophy is the absence of traditional road markings, signs, traffic signals and the disappearance of the distinction between sidewalk and roadway. User traffic becomes fluid and is motivated by natural human interactions and not according to naturally human regulation.