Road density in the tropical Asia-Pacific region is much higher than indicated by available global datasets. a, The study region, comprising part or all of Indonesia, Malaysia and Papua New Guinea (the yellow triangle shows the location of inset panels c–e). b, Cumulative plots comparing the total length of roads and proportion of land potentially affected by roads in this study versus data from OSM and GRIP. c–e, Mapped roads in a landscape in Sabah, Malaysian Borneo, as shown by GRIP (c; ...