diff --git a/osi_object.proto b/osi_object.proto
index 3030a3311..fb8a92536 100644
--- a/osi_object.proto
+++ b/osi_object.proto
@@ -108,6 +108,22 @@ message StationaryObject
         //
         optional EmittingStructureAttribute emitting_structure_attribute = 5;
 
+        // The IDs of the lanes that the object is assigned to.
+        //
+        // \note Might be multiple IDs if the object stretches over multiple lanes.
+        //
+        // \note OSI uses singular instead of plural for repeated field names.
+        //
+        repeated Identifier assigned_lane_id = 6;
+
+        // Percentage values of the object width in the corresponding lane.
+        //
+        // \note Might be multiple percentages if the object stretches over multiple lanes.
+        //
+        // \note OSI uses singular instead of plural for repeated field names.
+        //
+        repeated double assigned_lane_percentage = 7;
+
         // Definition of object types.
         //
         enum Type