diff --git a/Scripts/preprocess_daily.py b/Scripts/preprocess_daily.py
index 956da0487..ef5358dc4 100644
--- a/Scripts/preprocess_daily.py
+++ b/Scripts/preprocess_daily.py
@@ -403,7 +403,7 @@ class DailyPreprocessor():
                 turn_type = self.n2io2turn[node_id][(inc_edge_id, out_edge_id)]
                 self.match5.at[i, 'turn_type'] = turn_type
 
-        self.p2PLindices = dict() # parent id to protected left index
+        self.p2UPLindices = dict() # parent id to unprotected left index
 
 
     # 2-1-6
@@ -750,7 +750,7 @@ class DailyPreprocessor():
             u_turn_conn = inc_edge.getConnections(out_edge)[0]
             self.u2uindex[child_id] = u_turn_conn.getTLLinkIndex()
 
-        self.p2PLindices = dict() # parent id to protected left index
+        self.p2UPLindices = dict() # parent id to unprotected left index
         for parent_id in self.parent_ids:
             init_state = self.node2init[parent_id]
             # 우회전 이동류 인덱스
@@ -776,9 +776,9 @@ class DailyPreprocessor():
                 indices = [conn for conn in conns if conn.getJunctionIndex()>=0]
                 indices = [conn.getTLLinkIndex() for conn in conns]
                 indices_left.extend(indices)
-            # 비보호좌회전 인덱스 (protected left index)
-            PLindices = list((set(range(len(init_state))) - set(indices_right) - set(indices_assigned)).intersection(indices_left))
-            self.p2PLindices[parent_id] = PLindices
+            # 비보호좌회전 인덱스 (unprotected left index)
+            UPLindices = list((set(range(len(init_state))) - set(indices_right) - set(indices_assigned)).intersection(indices_left))
+            self.p2UPLindices[parent_id] = UPLindices
 
         print('2-2. 비보호우회전(g)을 배정했습니다.')