OSM itself is really just the base map. A huge, editable database of map data. Anyone can build apps that make use of that data - the route planner you used is

OSM itself is really just the base map. A huge, editable database of map data. Anyone can build apps that make use of that data - the route planner you used is just one of many. The routing errors you describe could be issues with the particular route planner you used, or they could be issues with the OSM data itself. Some parts of the world are indeed better mapped than others (this is also true of Google Maps), but the great thing about OSM is if you find an error you can fix it yourself in seconds. Just click that “edit” button right there in the OSM interface...