This paper focuses on the `bundling' concept, the safety effect and their combination. Bundling of infrastructure has been a planning principle for quite a long time. It is still the leading principle in locating infrastructure, based on the assumption that it can offer theoretical advantages. However, these advantages will not always appear in practice. This paradox can be explained by three factors. These factors can be seen as design considerations: (1) In theory, there are not only positive characteristics, but also negative ones, such as cumulation of negative effects, interference effects, etcetera; (2). When infrastructure is bundled, the general location principles must also be taken into account; and (3) the local effects depend on the morphology of the bundle. This implicates that the infrastructure types, the distance between the infrastructure, the way the infrastructure will be bundled, the internal order, and the building sequence will have their influence on the morphology. In addition, the actual situation concerning safety is discussed. The existing safety studies do not fulfil demands and needs in the decision-making process. No attention is paid to characteristics of bundling or bundling criteria. The information resulting from safety studies does not match with the decisionmakers' needs. Finally, the design considerations for bundling infrastructure are applied on the safety concept. (A)
Abstract