Make sure we only count turns as UTurns for the turn_function

CHANGELOG.md

@@ -2,6 +2,7 @@
   - Changes from 5.14.1:
     - Bugfixes:
       - FIXED #4727: Erroring when a old .core file is present.
+      - FIXED #4754: U-Turn penalties are applied to straight turns.
     - Node.js Bindings:
       - ADDED: Exposed new `max_radiuses_map_matching` option from `EngingConfig` options
     - Tools:

include/extractor/guidance/turn_instruction.hpp

@@ -77,7 +77,11 @@ struct TurnInstruction
 
     TurnType::Enum type : 5;
     DirectionModifier::Enum direction_modifier : 3;
-    // the lane tupel that is used for the turn
+
+    bool IsUTurn() const
+    {
+        return type == TurnType::Turn && direction_modifier == DirectionModifier::UTurn;
+    }
 
     static TurnInstruction INVALID() { return {TurnType::Invalid, DirectionModifier::UTurn}; }
 

src/extractor/edge_based_graph_factory.cpp

@@ -580,7 +580,7 @@ void EdgeBasedGraphFactory::GenerateEdgeExpandedEdges(
             ExtractionTurn extracted_turn(
                 turn.angle,
                 m_node_based_graph.GetOutDegree(node_at_center_of_intersection),
-                turn.instruction.direction_modifier == guidance::DirectionModifier::UTurn,
+                turn.instruction.IsUTurn(),
                 is_traffic_light,
                 edge_data1.flags.restricted,
                 edge_data2.flags.restricted,