What is meant by the cumulative opportunity measure in accessibility?

The cumulative opportunity measure in accessibility refers to the total number of destinations that can be reached within a specified distance or time frame from a particular location. This concept emphasizes the idea that accessibility is not just about reaching a single destination but rather about the cumulative opportunities that are available within a given reach. By measuring how many different destinations can be accessed, planners can evaluate the effectiveness of transit systems, road networks, and other factors that influence how easily people can access services, jobs, or recreational areas.

This measure is particularly valuable in urban planning and transportation analysis as it helps in assessing the overall connectivity of neighborhoods. For instance, if a person can reach many grocery stores, parks, schools, and workplaces within a 15-minute walk, the cumulative opportunity measure would reflect a high level of accessibility for that individual. Thus, it provides insight into the potential for equitable access to resources and amenities in various geographic locations.