Accessibility refers to the ability of people to overcome distance or other constraints and reach locations, activities, or services that are important to them. A number of different accessibility measures and concepts exist, though these can be classified into two distinct categories: (1) proximity (or zonal or aggregate) and (2) individual (or space-time or disaggregate) measures. Proximity measures show the nearness of one or more origin locations to a set of destinations, whether measured using distance, travel time, or other impedances. The closer an origin is to more destinations, the greater the accessibility of that origin. This notion is commonly calculated for points (such as cities) or zones (such as tracts) representing areas within a city. Origins might represent home locations, while destinations include jobs, ...

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