Great Britain and Ireland Due to a high density of urban centres in Britain and Ireland, accessibility is largely unimpeded – shown by light colours. Only in the highlands of Scotland are travel times increased, as indicated by dark colours. For their article in the journal Nature, Daniel Weiss and his colleagues used Open Street Map and Google to collate travel times to cities in 2015. All photographs: Daniel Weiss and Jennifer Rozier, Malaria Atlas Project, University of Oxford