diff --git a/envs/edge_vsl_env.py b/envs/edge_vsl_env.py
index 648b21f..15fce4c 100644
--- a/envs/edge_vsl_env.py
+++ b/envs/edge_vsl_env.py
@@ -81,10 +81,19 @@ class SUMOEdgeVSLEnvironment:
         for edge_id in self.control_edges:
             ei = self.parser.edge_info.get(edge_id)
             if ei and ei.detectors:
-                # 获取第一组检测器（pos_index=0）的所有交通车道
+                # 使用该 edge 实际存在的最小 pos_index，兼容从 metrics_1 开始编号的检测器
+                available_pos_indices = sorted({
+                    pos_index
+                    for (lane_idx, pos_index) in ei.detectors
+                    if lane_idx in ei.traffic_lane_indices
+                })
+                if not available_pos_indices:
+                    continue
+
                 first_group_dets = []
+                first_pos_index = available_pos_indices[0]
                 for lane_idx in ei.traffic_lane_indices:
-                    det_id = ei.detectors.get((lane_idx, 0))
+                    det_id = ei.detectors.get((lane_idx, first_pos_index))
                     if det_id:
                         first_group_dets.append(det_id)
                 self.edge_detector_map[edge_id] = first_group_dets