Speed '40mph' Map
This image shows the density of highways with a speed limit of 40mph (or equivalent in km/hr) in the Routino UK example database generated from the OpenStreetMap data for the UK. The locations are mapped into a zoom level 13 map tile (2x2 pixels on this scale) and the colour indicates the density of the particular speed-limited highway measured in metres of highway per square kilometre within the tile.