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===== Using Overpass to extract data from OpenStreetMap =====

I used the following [[https://overpass-turbo.eu/|Overpass]] files to measure the amount of cycle lanes in cities:

==== Total length of highways in Westminster ====

  [out:csv(number,length)];
  {{geocodeArea:Westminster}}->.searchArea;
  way["highway"]["highway"!="cycleway"]["highway"!="bridleway"]["highway"!="footway"]["highway"!="path"]["highway"!="service"]["access"!="private"](area.searchArea);
  make stat number=count(ways),length=sum(length());
  out;

==== Total length of segregated cycleways in Westminster ====

  [out:csv(number,length)];
  {{geocodeArea:Westminster}}->.searchArea;
  way["highway"="cycleway"]["foot"!="designated"](area.searchArea);
  make stat number=count(ways),length=sum(length());
  out;

==== Total length of segregated cycleways in Camden ====

  [out:csv(number,length)];
  {{geocodeArea:London borough of Camden}}->.searchArea;
  way["highway"="cycleway"](area.searchArea);
  make stat number=count(ways),length=sum(length());
  out;

==== Show all segregated cycleways in Westminster on a map ====

Click the zoom icon once generated

  [out:json];
  {{geocodeArea:Westminster}}->.searchArea;
  (
    way["highway"="cycleway"]["foot"!="designated"](area.searchArea);
  );
  out body;
  >;
  out skel qt;

==== Show only roads in Westminster on a map ====

  [out:json];
  {{geocodeArea:Westminster}}->.searchArea;
  (
    way["highway"]["highway"!="cycleway"]["highway"!="bridleway"]["highway"!="footway"]["highway"!="path"]["highway"!="service"]["access"!="private"](area.searchArea);
  );
  out body;
  >;
  out skel qt;
==== Show segregated cycle routes on current viewed map ====

  [bbox:{{bbox}}];
  ( 
    way["highway"="cycleway"];
  );
  out geom;

==== Other things I didn't write details for ====

  [out:csv(length,value)];
  area[name="London"]->.a;
  way[highway](area.a);
  for (t["highway"])
  {
    make stat value=_.val,length=sum(length());
    out;
  }

  [out:csv(length,value)];
  area[name="London"];
  way[highway="cycleway"];
  out
  for (t["highway"])
  {
    make stat value=_.val,length=sum(length());
    out;
  }

  [out:csv(length,value)];
  area[name="Isle of Man"]->.a;
  way[highway="cycleway"](area.a);
  for (t["highway"])
  {
    make stat value=_.val,length=sum(length());
    out;
  }

  [out:csv(length,value)];
  area[name="Isle of Man"]->.a;
  way[highway="cycleway"](area.a);
  make stats length=sum(length());
  out;

  [out:csv(length,value)];
  area[name="London"]
  .way[highway="cycleway"]
  .way[cycleway="sidewalk"];
  make stats length=sum(length());
  out;

  [out:csv(length,value)];
  area[name="London"];
  way[highway="cycleway"](area)->.a;
  way[highway="cycleway"](area)->.b;
  way.a.b;
  make stats length=sum(length());
  out;

  [out:csv(length,value)];
  area[name="London"];
  way[highway="cycleway"](area)->.a;
  way[cycleway!="sidewalk"](area)->.b;
  way[foot!="yes"](area)->.c;
  way.a.b.c;
  make stats length=sum(length());
  out;