diff --git a/autoware_launch/config/planning/scenario_planning/lane_driving/behavior_planning/behavior_path_planner/start_planner/start_planner.param.yaml b/autoware_launch/config/planning/scenario_planning/lane_driving/behavior_planning/behavior_path_planner/start_planner/start_planner.param.yaml
index da2c6da930..80114889d7 100644
--- a/autoware_launch/config/planning/scenario_planning/lane_driving/behavior_planning/behavior_path_planner/start_planner/start_planner.param.yaml
+++ b/autoware_launch/config/planning/scenario_planning/lane_driving/behavior_planning/behavior_path_planner/start_planner/start_planner.param.yaml
@@ -4,7 +4,6 @@
       th_arrived_distance: 1.0
       th_stopped_velocity: 0.01
       th_stopped_time: 1.0
-      th_blinker_on_lateral_offset: 1.0
       collision_check_margin: 1.0
       collision_check_distance_from_end: 1.0
       # shift pull out
@@ -30,3 +29,7 @@
       backward_search_resolution: 2.0
       backward_path_update_duration: 3.0
       ignore_distance_from_lane_end: 15.0
+      # turns signal
+      th_turn_signal_on_lateral_offset: 1.0
+      intersection_search_length: 30.0
+      length_ratio_for_turn_signal_deactivation_near_intersection: 0.5