Fig. 2

Travel time to any health centre in (a) Uganda, (b) Tanzania (c) Zimbabwe and (d) Mozambique calculated using the CPAS method and produced on a 20 m raster grid. These data are available for download (see Supplementary Table B). Google street view images showing pedestrians using the sides of major roads and highways in Uganda (e), included to demonstrate that a walking speed of 5 km/hr is appropriate for highways.