For more details about these modules, take a look at our Accessibility Module Technical Documentation 

The walk and transit modules allow for rapid assessment of the proximity of each parcel (or block) in a project area to certain destinations. It is a two-dimensional representation of all known paths (e.g., sidewalks, park walk paths, and streets), intersections, transit stops, and transit route paths that have components with start and end coordinates and that are connected by “edge” attributes. The edge holds additional relevant information, such as distance, time, or cost, which helps users determine the shortest or most feasible path.

The proximity is based on a road and walk path network. A transit network is included in the transit module. It is composed of the transit service providers that operate routes in the project area. The transit service schedule data determines the frequency of transfers and the average wait time for transferring between routes. 

The distance from a block or parcel to a point of interest (POI) is reported in minutes. The time necessary to reach a particular POI is based on the shortest distance (within the network) that is provided to the module. Specifically, distance is not calculated “as the crow flies.” 

Examples of information provided by this metric include the time required to walk from a given lot to the nearest hospital and the number of jobs near a given block that can be reached on foot or by transit within 30 minutes. 

Key Logic Assumptions:

  • Because schedule headways are averaged, headways between trips on a given transit route are assumed equal during the GTFS sub-schedule time period.
  • Because elevation has not yet been included as a factor in network walk traversal, walk speed is considered static without regard for the slope of a given network edge.
  • The cost of transfers between two transit routes is always assumed to be half the headway of the later route. Timed transfers and awareness of schedule synchronization has not yet been accounted for.
  • Programmatically added links between transit network stop nodes and walk network nodes are assumed to be traversable, but OSM data for barriers (e.g., low walls) have not yet been considered.

Walk Accessibility Chart Summary

Note: If you hover over the horizontal chart, it displays the percentage of the population in the Project Area that can access the given locations within a given time frame.

The chart summary for Walk Access analytics include:

  • Access to Nearest School by Walk - Percentage of the population that can access a school within a specific time frame
  • Access to Nearest Hospital by Walk - Percentage of the population that can access a hospital within a specific time frame
  • Access to Nearest Restaurant by Walk - Percentage of the population that can access a restaurant within a specific time frame
  • Access to Nearest Park by Walk - Percentage of the population that can access a park within a specific time frame
  • Access to Nearest Transit Stop by Walk - Percentage of the population that can access a school within a specific time frame

Transit Accessibility Chart Summary

  • Access to Nearest School by Walk and Transit - Percentage of the population that can access the nearest school via public transit within a specific time frame
  • Access to Nearest Hospital by Walk and Transit - Percentage of the population that can access a hospital via public transit within a specific time frame
  • Access to Nearest Restaurant by Walk - Percentage of the population that can access a restaurant via public transit within a specific time frame
  • Access to Nearest Park by Walk - Percentage of the population that can access a Park via public transit within a specific time frame
  • Population Access to 10% of all jobs - Percentage of the population that can access at least 10% of Jobs within a Project Area
  • Population Access to 25% of all jobs - Percentage of the population that can access at least 25% of Jobs within a Project Area
  • Population Access to 50% of all jobs - Percent of the population that can access at least 50% of Jobs within a Project Area.
Did this answer your question?