diff --git a/common/autoware_lanelet2_utils/include/autoware/lanelet2_utils/intersection.hpp b/common/autoware_lanelet2_utils/include/autoware/lanelet2_utils/intersection.hpp
index 88206d5a05..f8d02a67ce 100644
--- a/common/autoware_lanelet2_utils/include/autoware/lanelet2_utils/intersection.hpp
+++ b/common/autoware_lanelet2_utils/include/autoware/lanelet2_utils/intersection.hpp
@@ -19,7 +19,7 @@
 
 #include <optional>
 
-namespace autoware::lanelet2_utils
+namespace autoware::experimental::lanelet2_utils
 {
 
 static constexpr const char * k_turn_direction = "turn_direction";
@@ -68,5 +68,5 @@ bool is_right_direction(const lanelet::ConstLanelet & lanelet);
  */
 std::optional<TurnDirection> get_turn_direction(const lanelet::ConstLanelet & lanelet);
 
-}  // namespace autoware::lanelet2_utils
+}  // namespace autoware::experimental::lanelet2_utils
 #endif  // AUTOWARE__LANELET2_UTILS__INTERSECTION_HPP_
diff --git a/common/autoware_lanelet2_utils/include/autoware/lanelet2_utils/kind.hpp b/common/autoware_lanelet2_utils/include/autoware/lanelet2_utils/kind.hpp
index 330e92d72d..79e9e046d4 100644
--- a/common/autoware_lanelet2_utils/include/autoware/lanelet2_utils/kind.hpp
+++ b/common/autoware_lanelet2_utils/include/autoware/lanelet2_utils/kind.hpp
@@ -17,7 +17,7 @@
 
 #include <lanelet2_core/Forward.h>
 
-namespace autoware::lanelet2_utils
+namespace autoware::experimental::lanelet2_utils
 {
 static constexpr const char * k_road_lane_type = "road";
 static constexpr const char * k_shoulder_lane_type = "road_shoulder";
@@ -58,5 +58,5 @@ bool is_shoulder_lane(const lanelet::ConstLanelet & lanelet);
  * @return if the lanelet is bicycle_lane or not
  */
 bool is_bicycle_lane(const lanelet::ConstLanelet & lanelet);
-}  // namespace autoware::lanelet2_utils
+}  // namespace autoware::experimental::lanelet2_utils
 #endif  // AUTOWARE__LANELET2_UTILS__KIND_HPP_
diff --git a/common/autoware_lanelet2_utils/include/autoware/lanelet2_utils/topology.hpp b/common/autoware_lanelet2_utils/include/autoware/lanelet2_utils/topology.hpp
index 5f9207b756..b3203c4b65 100644
--- a/common/autoware_lanelet2_utils/include/autoware/lanelet2_utils/topology.hpp
+++ b/common/autoware_lanelet2_utils/include/autoware/lanelet2_utils/topology.hpp
@@ -22,7 +22,7 @@
 #include <optional>
 #include <vector>
 
-namespace autoware::lanelet2_utils
+namespace autoware::experimental::lanelet2_utils
 {
 /**
  * @brief instantiate RoutingGraph from given LaneletMap only from "road" lanes
@@ -181,6 +181,6 @@ lanelet::ConstLanelets sibling_lanelets(
  */
 lanelet::ConstLanelets from_ids(
   const lanelet::LaneletMapConstPtr lanelet_map, const std::vector<lanelet::Id> & ids);
-}  // namespace autoware::lanelet2_utils
+}  // namespace autoware::experimental::lanelet2_utils
 
 #endif  // AUTOWARE__LANELET2_UTILS__TOPOLOGY_HPP_
diff --git a/common/autoware_lanelet2_utils/src/intersection.cpp b/common/autoware_lanelet2_utils/src/intersection.cpp
index 710dd5e3ed..6dea4e1a3f 100644
--- a/common/autoware_lanelet2_utils/src/intersection.cpp
+++ b/common/autoware_lanelet2_utils/src/intersection.cpp
@@ -17,7 +17,7 @@
 #include <lanelet2_core/primitives/Lanelet.h>
 
 #include <cstring>
-namespace autoware::lanelet2_utils
+namespace autoware::experimental::lanelet2_utils
 {
 
 bool is_intersection_lanelet(const lanelet::ConstLanelet & lanelet)
@@ -54,4 +54,4 @@ std::optional<TurnDirection> get_turn_direction(const lanelet::ConstLanelet & la
   return std::nullopt;
 }
 
-}  // namespace autoware::lanelet2_utils
+}  // namespace autoware::experimental::lanelet2_utils
diff --git a/common/autoware_lanelet2_utils/src/kind.cpp b/common/autoware_lanelet2_utils/src/kind.cpp
index 824f09f146..9b4cb0d253 100644
--- a/common/autoware_lanelet2_utils/src/kind.cpp
+++ b/common/autoware_lanelet2_utils/src/kind.cpp
@@ -17,7 +17,7 @@
 #include <lanelet2_core/primitives/Lanelet.h>
 
 #include <cstring>
-namespace autoware::lanelet2_utils
+namespace autoware::experimental::lanelet2_utils
 {
 bool is_road_lane(const lanelet::ConstLanelet & lanelet)
 {
@@ -36,4 +36,4 @@ bool is_bicycle_lane(const lanelet::ConstLanelet & lanelet)
   return std::strcmp(
            lanelet.attributeOr(lanelet::AttributeName::Subtype, "none"), k_bicycle_lane_type) == 0;
 }
-}  // namespace autoware::lanelet2_utils
+}  // namespace autoware::experimental::lanelet2_utils
diff --git a/common/autoware_lanelet2_utils/src/topology.cpp b/common/autoware_lanelet2_utils/src/topology.cpp
index d3f64f995e..9b8a669de5 100644
--- a/common/autoware_lanelet2_utils/src/topology.cpp
+++ b/common/autoware_lanelet2_utils/src/topology.cpp
@@ -21,7 +21,7 @@
 
 #include <vector>
 
-namespace autoware::lanelet2_utils
+namespace autoware::experimental::lanelet2_utils
 {
 
 static constexpr size_t k_normal_bundle_max_size = 10;
@@ -262,4 +262,4 @@ lanelet::ConstLanelets from_ids(
          }) |
          ranges::to<std::vector>();
 }
-}  // namespace autoware::lanelet2_utils
+}  // namespace autoware::experimental::lanelet2_utils
diff --git a/common/autoware_lanelet2_utils/test/intersection.cpp b/common/autoware_lanelet2_utils/test/intersection.cpp
index 47e2030d46..4ccc9860e1 100644
--- a/common/autoware_lanelet2_utils/test/intersection.cpp
+++ b/common/autoware_lanelet2_utils/test/intersection.cpp
@@ -24,7 +24,7 @@
 
 namespace fs = std::filesystem;
 
-namespace autoware
+namespace autoware::experimental
 {
 class TestWithIntersectionCrossingMap : public ::testing::Test
 {
@@ -110,7 +110,7 @@ TEST_F(TestWithIntersectionCrossingMap, get_turn_direction)
   }
 }
 
-}  // namespace autoware
+}  // namespace autoware::experimental
 
 int main(int argc, char ** argv)
 {
diff --git a/common/autoware_lanelet2_utils/test/kind.cpp b/common/autoware_lanelet2_utils/test/kind.cpp
index 8cdc6dca14..996f958c60 100644
--- a/common/autoware_lanelet2_utils/test/kind.cpp
+++ b/common/autoware_lanelet2_utils/test/kind.cpp
@@ -24,7 +24,7 @@
 
 namespace fs = std::filesystem;
 
-namespace autoware
+namespace autoware::experimental
 {
 class TestWithRoadShoulderHighwayMap : public ::testing::Test
 {
@@ -88,7 +88,7 @@ TEST_F(TestWithIntersectionCrossingMap, is_shoulder_lane)
   EXPECT_EQ(lanelet2_utils::is_shoulder_lane(ll), false);
   EXPECT_EQ(lanelet2_utils::is_bicycle_lane(ll), true);
 }
-}  // namespace autoware
+}  // namespace autoware::experimental
 
 int main(int argc, char ** argv)
 {
diff --git a/common/autoware_lanelet2_utils/test/topology.cpp b/common/autoware_lanelet2_utils/test/topology.cpp
index 915bf0cd43..e21b3c4fe0 100644
--- a/common/autoware_lanelet2_utils/test/topology.cpp
+++ b/common/autoware_lanelet2_utils/test/topology.cpp
@@ -28,7 +28,7 @@
 
 namespace fs = std::filesystem;
 
-namespace autoware
+namespace autoware::experimental
 {
 
 class TestWithIntersectionCrossingMap : public ::testing::Test
@@ -289,7 +289,7 @@ TEST_F(TestWithIntersectionCrossingInverseMap, left_lanelets_with_opposite_witho
   EXPECT_EQ(lefts[0].id(), 2252);
 }
 
-}  // namespace autoware
+}  // namespace autoware::experimental
 
 int main(int argc, char ** argv)
 {