[traffic] Ignore access flags when decoding closure events

Fixes decoding of closures which are mapped in OSM as access restrictions

Signed-off-by: mvglasow <michael -at- vonglasow.com>

libs/routing/edge_estimator.hpp

@@ -144,6 +144,18 @@ public:
    */
   virtual double GetFerryLandingPenalty(Purpose purpose) const = 0;
 
+  /**
+   * @brief Whether access restrictions are ignored.
+   *
+   * A return value of false indicates that access restrictions should be observed, which is the
+   * default behavior for a routing use case. If true, it indicates that routing should ignore
+   * access restrictions. This is needed to resolve traffic message locations; it could also be
+   * used e.g. for emergency vehicle use cases.
+   *
+   * This implementation always returns false.
+   */
+  virtual bool IsAccessIgnored() { return false; }
+
   /**
    * @brief Creates an `EdgeEstimator` based on maximum speeds.
    *

libs/routing/index_graph.hpp

@@ -217,6 +217,9 @@ template <typename AccessPositionType>
 bool IndexGraph::IsAccessNoForSure(AccessPositionType const & accessPositionType, RouteWeight const & weight,
                                    bool useAccessConditional) const
 {
+  if (m_estimator->IsAccessIgnored())
+    return false;
+
   auto const [accessType, confidence] = useAccessConditional
                                           ? m_roadAccess.GetAccess(accessPositionType, weight)
                                           : m_roadAccess.GetAccessWithoutConditional(accessPositionType);