This chapter presents a conceptual framework for studyingudurban performance from a transportation perspective in effort toudidentify and define research issues and concepts related to urbanudperformance. A key concept in this framework is accessibility, whichudis defined and analysed in section 'Infrastructure, Accessibility andudReach'. In general, accessibility refers to the ability to visit activityudplaces (shops, work places, services etc.) by using a particularudtransport system at an acceptable cost in terms of time or money
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