A number of approaches has been developed and adopted to set speed limits in interurban roads. Among others, the Australian family of applications (XLimits), later also adopted in the USA, is a relevant example of this type of approach. This model enables the selection of adequate speed limits by taking into consideration a wide set of explanatory variables, aiming at describing the infrastructure, land use, local safety and operational characteristics. Hence, the major objective of this work is to provide a generalized decision-support methodology for speed limit setting in interurban single carriageway roads, crossing different types of road environments, considering a range of objective variables. This work thoroughly describes the methodological approach to be used in this phase, which involves the evaluation of experts and the collection of a set of variables related with the road environment. Some early results, regarding these evaluation, are presented and discussed.
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