1. dc.osm - http://download.geofabrik.de/north-america/us/district-of-columbia.html  and renamed to dc.osm
2. dc_hospitals.sql extract of hospitals from dc.osm points layer using ogr_fdw extension
3. nuclear_power_plants.sql comes from WikiPedia list of all nuclear power plants https://en.wikipedia.org/wiki/List_of_nuclear_power_stations
 location was converted to degrees and then transformed to a European LAEA projection to better preserve distance.
4. ospo_2po_4gr.sql is file generated by osm2po using the dc.osm file 
5. ospr_data.psql are tables in the ospr schema. The ways and ways_vertices_pgr were loaded by osp2pgrouting
while the restrictions was formulated using data loaded via ogr_fdw spatial foreign data wrapper.
The exercise for creating the restrictions table is discussed in Turn Restrictions chapter.
 
 Refer to readme of subfolders for info of other data sources