fix(lane_change): remove overlapping preceding lanes

planning/behavior_path_planner/autoware_behavior_path_lane_change_module/include/autoware/behavior_path_lane_change_module/utils/utils.hpp

@@ -382,5 +382,21 @@ bool filter_target_lane_objects(
   const double dist_ego_to_current_lanes_center, const bool ahead_of_ego,
   const bool before_terminal, TargetLaneLeadingObjects & leading_objects,
   ExtendedPredictedObjects & trailing_objects);
+
+/**
+ * @brief Retrieves the preceding lanes for the target lanes while removing overlapping and
+ * disconnected lanes.
+ *
+ * This function identifies all lanes that precede the target lanes based on the ego vehicle's
+ * current position and a specified backward search length. The resulting preceding lanes are
+ * filtered to remove lanes that overlap with the current lanes or are not connected to the route.
+ *
+ * @param common_data_ptr Shared pointer to commonly used data in lane change module, which contains
+ * route handler information, lane details, ego vehicle pose, and behavior parameters.
+ *
+ * @return A vector of preceding lanelet groups, with each group containing only the connected and
+ * non-overlapping preceding lanes.
+ */
+std::vector<lanelet::ConstLanelets> get_preceding_lanes(const CommonDataPtr & common_data_ptr);
 }  // namespace autoware::behavior_path_planner::utils::lane_change
 #endif  // AUTOWARE__BEHAVIOR_PATH_LANE_CHANGE_MODULE__UTILS__UTILS_HPP_

planning/behavior_path_planner/autoware_behavior_path_lane_change_module/src/scene.cpp

@@ -1,4 +1,4 @@
 // Copyright 2023 TIER IV, Inc.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -112,9 +112,8 @@
   common_data_ptr_->lanes_ptr->target_lane_in_goal_section =
     route_handler_ptr->isInGoalRouteSection(target_lanes.back());
 
-  common_data_ptr_->lanes_ptr->preceding_target = utils::getPrecedingLanelets(
-    *route_handler_ptr, get_target_lanes(), common_data_ptr_->get_ego_pose(),
-    common_data_ptr_->lc_param_ptr->backward_lane_length);
+  common_data_ptr_->lanes_ptr->preceding_target =
+    utils::lane_change::get_preceding_lanes(common_data_ptr_);
 
   lane_change_debug_.current_lanes = common_data_ptr_->lanes_ptr->current;
   lane_change_debug_.target_lanes = common_data_ptr_->lanes_ptr->target;

planning/behavior_path_planner/autoware_behavior_path_lane_change_module/src/utils/utils.cpp

@@ -1,4 +1,4 @@
 // Copyright 2021 Tier IV, Inc.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -34,7 +34,12 @@
 #include <autoware_lanelet2_extension/utility/query.hpp>
 #include <autoware_lanelet2_extension/utility/utilities.hpp>
 #include <autoware_vehicle_info_utils/vehicle_info.hpp>
+#include <range/v3/action/insert.hpp>
 #include <range/v3/algorithm/any_of.hpp>
+#include <range/v3/algorithm/find_if.hpp>
+#include <range/v3/algorithm/for_each.hpp>
+#include <range/v3/range/conversion.hpp>
+#include <range/v3/view.hpp>
 #include <rclcpp/rclcpp.hpp>
 
 #include <geometry_msgs/msg/detail/pose__struct.hpp>
@@ -54,6 +59,7 @@
 #include <memory>
 #include <optional>
 #include <string>
+#include <unordered_set>
 #include <vector>
 
 namespace autoware::behavior_path_planner::utils::lane_change
@@ -1247,4 +1253,41 @@
 
   return false;
 }
+
+std::vector<lanelet::ConstLanelets> get_preceding_lanes(const CommonDataPtr & common_data_ptr)
+{
+  const auto & route_handler_ptr = common_data_ptr->route_handler_ptr;
+  const auto & target_lanes = common_data_ptr->lanes_ptr->target;
+  const auto & ego_pose = common_data_ptr->get_ego_pose();
+  const auto backward_lane_length = common_data_ptr->lc_param_ptr->backward_lane_length;
+
+  const auto preceding_lanes_list =
+    utils::getPrecedingLanelets(*route_handler_ptr, target_lanes, ego_pose, backward_lane_length);
+
+  const auto & current_lanes = common_data_ptr->lanes_ptr->current;
+  std::unordered_set<lanelet::Id> current_lanes_id;
+  for (const auto & lane : current_lanes) {
+    current_lanes_id.insert(lane.id());
+  }
+  const auto is_overlapping = [&](const lanelet::ConstLanelet & lane) {
+    return current_lanes_id.find(lane.id()) != current_lanes_id.end();
+  };
+
+  std::vector<lanelet::ConstLanelets> non_overlapping_lanes_vec;
+  for (const auto & lanes : preceding_lanes_list) {
+    auto lanes_reversed = lanes | ranges::views::reverse;
+    auto overlapped_itr = ranges::find_if(lanes_reversed, is_overlapping);
+
+    if (overlapped_itr == lanes_reversed.begin()) {
+      continue;
+    }
+
+    // Lanes are not reversed by default. Avoid returning reversed lanes to prevent undefined
+    // behavior.
+    lanelet::ConstLanelets non_overlapping_lanes(overlapped_itr.base(), lanes.end());
+    non_overlapping_lanes_vec.push_back(non_overlapping_lanes);
+  }
+
+  return non_overlapping_lanes_vec;
+}
 }  // namespace autoware::behavior_path_planner::utils::lane_change