Abortion facility access means long drives for 41.8% of women
isochrone
is a line on a map indicating equal travel time from a location. Isochrone areas indicate how far a person can travel in a given amount of time. We used the Valhallatool to compute the access isochrones, or the distance from each abortion clinic, using Valhalla's isochrone application programming interface in R. Valhalla is an open-source routing engine that uses OpenStreetMap road network data to map the boundaries of how far one can travel in a given time from one point.
We then calculated the Census tract area percentage inside and outside of the access isochrones using 2020 U.S. Census data for women of reproductive age . Census tracts are a method to geographically subdivide the country. Census tracts contain, on average, 4,000 people . Census tracts are used by the U.S. Census Bureau to aggregate and summarize data while keeping information anonymous.
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