return speed annotations

include/engine/api/route_api.hpp

@@ -235,6 +235,14 @@ class RouteAPI : public BaseAPI
                 auto &leg_geometry = leg_geometries[idx];
                 util::json::Object annotation;
 
+                if (parameters.annotations_type & RouteParameters::AnnotationsType::Speed)
+                {
+                    annotation.values["speed"] = GetAnnotations(
+                        leg_geometry, [](const guidance::LegGeometry::Annotation &anno) {
+                            return anno.distance / anno.duration;
+                        });
+                }
+
                 if (parameters.annotations_type & RouteParameters::AnnotationsType::Duration)
                 {
                     annotation.values["duration"] = GetAnnotations(

include/engine/api/route_parameters.hpp

@@ -75,7 +75,8 @@ struct RouteParameters : public BaseParameters
         Distance = 0x04,
         Weight = 0x08,
         Datasources = 0x10,
-        All = Duration | Nodes | Distance | Weight | Datasources
+        Speed = 0x20,
+        All = Duration | Nodes | Distance | Weight | Datasources | Speed
     };
 
     RouteParameters() = default;