Uploaded on 2014-10-19 by BeckerSP

[1]: https://edxuploads.s3.amazonaws.com/14137195669971227.jpg This is a picture of a heavy intervention in a busy place in Sao Paulo city, Brazil. There is plenty of visible things in the picture - commercial and residencial buildings and the street, people, bus, cars, cab, traffic diversion equipment, a metro station being built and provisional aerial wiring (being organised)! How to make it wright? The invisible is just beginning in this photo - can be extended in area and time. First comes the safety issues and concern for the people and buildings, then the propagation of heavy traffic nearby, in fact in some kilometers radius. In order to contribute to the planning of a more liveable urban space, during the construction of a major infrastructure such as the METRO that spans over years, it's very important to take good care of invisible information - what shall be done to reduce and control the risk the people, property and environment are subject to. It's about making the invisible INVISIBLE.