diff --git a/src/Mod/FreeCADExchange/AutoRouting.py b/src/Mod/FreeCADExchange/AutoRouting.py
index 544385b..502c855 100644
--- a/src/Mod/FreeCADExchange/AutoRouting.py
+++ b/src/Mod/FreeCADExchange/AutoRouting.py
@@ -144,13 +144,19 @@ def _lane_payload(route_index, options):
     lane_axis = (opts.get("lane_axis") or "y").lower()
     if lane_axis not in {"x", "y", "z"}:
         lane_axis = "y"
-    lane_index = int(route_index or 0)
+    lane_index = max(int(route_index or 0), 0)
     lane_spacing = float(opts.get("lane_spacing", 0.0) or 0.0)
+    if lane_index <= 0:
+        lane_offset = 0.0
+    else:
+        lane_order = (lane_index + 1) // 2
+        lane_direction = 1.0 if lane_index % 2 == 1 else -1.0
+        lane_offset = float(lane_order) * lane_spacing * lane_direction
     return {
         "index": lane_index,
         "axis": lane_axis,
         "spacing_mm": lane_spacing,
-        "offset_mm": float(lane_index) * lane_spacing,
+        "offset_mm": lane_offset,
     }
 
 
@@ -809,6 +815,7 @@ def collect_obstacles(doc, exclude=None, options=None):
             continue
         if RoutingNetwork.is_route_carrier(obj) or WiringObjects.is_routed_wire_object(obj):
             continue
+        raw_bbox = _bbox_payload(obj, clearance=0.0)
         bbox = _bbox_payload(obj, clearance=clearance)
         if bbox is None:
             continue
@@ -823,6 +830,7 @@ def collect_obstacles(doc, exclude=None, options=None):
                 "label": getattr(obj, "Label", ""),
                 "type_id": getattr(obj, "TypeId", ""),
                 "bbox": bbox,
+                "raw_bbox": raw_bbox or bbox,
             }
         )
     return obstacles
@@ -871,8 +879,12 @@ def detect_collisions(points, obstacles, ignored_segment_indices=None):
                 collisions.append(
                     {
                         "segment_index": index,
+                        "segment_start": _point_payload(start),
+                        "segment_end": _point_payload(end),
                         "obstacle_name": obstacle.get("name", ""),
                         "obstacle_label": obstacle.get("label", ""),
+                        "obstacle_bbox": dict(obstacle.get("raw_bbox") or obstacle.get("bbox") or {}),
+                        "collision_bbox": dict(obstacle.get("bbox", {}) or {}),
                     }
                 )
     return collisions
diff --git a/tests/python/freecad_exchange_auto_routing_test.py b/tests/python/freecad_exchange_auto_routing_test.py
index 8d1ffbc..4589cd7 100644
--- a/tests/python/freecad_exchange_auto_routing_test.py
+++ b/tests/python/freecad_exchange_auto_routing_test.py
@@ -312,13 +312,25 @@ class AutoRoutingTest(unittest.TestCase):
             wire_uuid="wire-2",
             options={"lane_spacing": 12.0, "lane_axis": "y"},
         )
+        third = auto_routing.route_eplan_connection_between_terminals(
+            doc,
+            start,
+            end,
+            route_index=2,
+            wire_uuid="wire-3",
+            options={"lane_spacing": 12.0, "lane_axis": "y"},
+        )
         payload = json.loads(second["wire"].QetRouteDiagnosticsJson)
+        third_payload = json.loads(third["wire"].QetRouteDiagnosticsJson)
 
         self.assertTrue(any(abs(point.y - 0.0) <= 0.001 for point in first["points"][1:-1]))
         self.assertTrue(any(abs(point.y - 12.0) <= 0.001 for point in second["points"][1:-1]))
+        self.assertTrue(any(abs(point.y + 12.0) <= 0.001 for point in third["points"][1:-1]))
         self.assertEqual(1, payload["lane"]["index"])
         self.assertEqual("y", payload["lane"]["axis"])
         self.assertEqual(12.0, payload["lane"]["offset_mm"])
+        self.assertEqual(2, third_payload["lane"]["index"])
+        self.assertEqual(-12.0, third_payload["lane"]["offset_mm"])
 
     def test_eplan_connection_route_replaces_existing_wire_uuid_when_endpoints_change(self):
         _install_fake_freecad()
@@ -1364,6 +1376,10 @@ class AutoRoutingTest(unittest.TestCase):
         self.assertEqual("wire-1", report["collision_samples"][0]["wire_uuid"])
         self.assertEqual("N4111", report["collision_samples"][0]["wire_label"])
         self.assertEqual("MiddleObstacle", report["collision_samples"][0]["obstacle_name"])
+        self.assertEqual({"x": 0.0, "y": 0.0, "z": 100.0}, report["collision_samples"][0]["segment_start"])
+        self.assertEqual({"x": 100.0, "y": 0.0, "z": 100.0}, report["collision_samples"][0]["segment_end"])
+        self.assertEqual(40.0, report["collision_samples"][0]["obstacle_bbox"]["xmin"])
+        self.assertEqual(35.0, report["collision_samples"][0]["collision_bbox"]["xmin"])
         self.assertEqual("Middle Obstacle", report["routes"][0]["collision_samples"][0]["obstacle_label"])
         self.assertIn("碰撞示例", message)
         self.assertIn("Middle Obstacle", message)