[routing] New API for lanes

Signed-off-by: Andrei Shkrob <github@shkrob.dev>

libs/routing/lanes/lanes_recommendation.hpp

@@ -0,0 +1,31 @@
+#pragma once
+
+#include "routing/lanes/lane_info.hpp"
+
+#include <vector>
+
+namespace routing
+{
+class RouteSegment;
+
+namespace turns
+{
+enum class CarDirection;
+}  // namespace turns
+}  // namespace routing
+
+namespace routing::turns::lanes
+{
+/// Selects lanes which are recommended for an end user.
+void SelectRecommendedLanes(std::vector<RouteSegment> & routeSegments);
+
+// Keep signatures in the header for testing purposes
+namespace impl
+{
+bool SetRecommendedLaneWays(CarDirection carDirection, LanesInfo & lanesInfo);
+
+bool SetRecommendedLaneWaysApproximately(CarDirection carDirection, LanesInfo & lanesInfo);
+
+bool SetUnrestrictedLaneAsRecommended(CarDirection carDirection, LanesInfo & lanesInfo);
+}  // namespace impl
+}  // namespace routing::turns::lanes