The main objective of the project QSIDE is to demonstrate how European cities can effectively reduce harmful effects of traffic noise (annoyance and sleep disturbance) by offering refuges to the inhabitants: quiet facades and quiet areas. For example, a quiet façade offers the possibility to choose a bedroom on the quiet side of a house, thereby reducing the chances on sleep dusturbance by traffic noise. The refuges can be created in new urban areas, but they can also be created by modifying exisitng urban areas, for example by modifying traffic flows or by choosing specific orientations of houses with respect to roads. The benefits of quiet facades and areas will be demonstrated by performing detailed traffic noise mapping calculations for ciets, employing a new noise assessment methodology including the benefits from quiet facades and areas