Public transit (like buses and subways) connects people with their jobs, schools, healthcare, recreation, and more. However, typical fixed-route transit systems serve only the people and areas within a short distance of transit stops. Many maps inadvertently over-estimate the area and people served by the transit system. Check out this post on the Esri blog to find out why that is and what can be done about it:
Who does my public transit system serve? | ArcGIS Blog