Developing a `sustainably safe' road network involves the completion of various design phases. A tool has been developed to better understand how `sustainably safe' a road network in an area is. This `sustainable safety meter' can be used in the various design and implementation phases to determine the level of `sustainable safety'. This report is an account of the phased development of the `sustainable safety meter'. The first phase concerned a desk study that attempted to assign measurable indicators and criteria to the `sustainable safety' requirements. In this way, a prototype for the `sustainable safety meter' was created. At the same time, the kind of information necessary for obtaining a measurement became clear. The second phase consisted of an experimental test of this prototype under practical conditions, in this case, in West-Zeeuwsch-Vlaanderen, Netherlands. The test run showed that not all design phases could be clearly classified. The study also showed that the `sustainable safety' requirements concerning the homogeneity of traffic flows could best be covered by the indicators. In general, it would also be feasible to express the requirements related to the predictability of both traffic situations and the behaviour of road users in indicators. For the requirements related to the functionality of infrastructure, this would be more difficult.
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