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Urban mobility problems, such as congestion, have been threatening the quality of life, competitiveness, and sustainable development of urban areas. The need for an integrated approach to land use and transport in mobility management has been widely recognised. Accessibility measures are believed to provide a useful framework to support this integrated approach. Some of these measures can also reveal the mobility potential created by urban structures. This paper introduces the concept of structural accessibility and a new planning tool—the Structural Accessibility Layer (SAL). This tool measures structural accessibility by comparing accessibility levels between different transport modes to a range of activities in a given territory. An application to Greater Oporto is developed in order to discuss the potential of SAL for planning practice. Results were assessed by a number of local experts discussing its …