diff --git a/automotive/vehicle/aidl/generated_lib/cpp/AccessForVehicleProperty.h b/automotive/vehicle/aidl/generated_lib/cpp/AccessForVehicleProperty.h
index 1ef5925..ba44e07 100644
--- a/automotive/vehicle/aidl/generated_lib/cpp/AccessForVehicleProperty.h
+++ b/automotive/vehicle/aidl/generated_lib/cpp/AccessForVehicleProperty.h
@@ -292,6 +292,7 @@
         {VehicleProperty::LOW_SPEED_COLLISION_WARNING_ENABLED, VehiclePropertyAccess::READ_WRITE},
         {VehicleProperty::LOW_SPEED_COLLISION_WARNING_STATE, VehiclePropertyAccess::READ},
         {VehicleProperty::CROSS_TRAFFIC_MONITORING_ENABLED, VehiclePropertyAccess::READ_WRITE},
+        {VehicleProperty::CROSS_TRAFFIC_MONITORING_WARNING_STATE, VehiclePropertyAccess::READ},
 };
 
 }  // namespace vehicle
diff --git a/automotive/vehicle/aidl/generated_lib/cpp/ChangeModeForVehicleProperty.h b/automotive/vehicle/aidl/generated_lib/cpp/ChangeModeForVehicleProperty.h
index 8218d85..a720f2d 100644
--- a/automotive/vehicle/aidl/generated_lib/cpp/ChangeModeForVehicleProperty.h
+++ b/automotive/vehicle/aidl/generated_lib/cpp/ChangeModeForVehicleProperty.h
@@ -292,6 +292,7 @@
         {VehicleProperty::LOW_SPEED_COLLISION_WARNING_ENABLED, VehiclePropertyChangeMode::ON_CHANGE},
         {VehicleProperty::LOW_SPEED_COLLISION_WARNING_STATE, VehiclePropertyChangeMode::ON_CHANGE},
         {VehicleProperty::CROSS_TRAFFIC_MONITORING_ENABLED, VehiclePropertyChangeMode::ON_CHANGE},
+        {VehicleProperty::CROSS_TRAFFIC_MONITORING_WARNING_STATE, VehiclePropertyChangeMode::ON_CHANGE},
 };
 
 }  // namespace vehicle
diff --git a/automotive/vehicle/aidl/generated_lib/java/AccessForVehicleProperty.java b/automotive/vehicle/aidl/generated_lib/java/AccessForVehicleProperty.java
index b571e80..be849f5 100644
--- a/automotive/vehicle/aidl/generated_lib/java/AccessForVehicleProperty.java
+++ b/automotive/vehicle/aidl/generated_lib/java/AccessForVehicleProperty.java
@@ -283,7 +283,8 @@
         Map.entry(VehicleProperty.DRIVER_DISTRACTION_WARNING, VehiclePropertyAccess.READ),
         Map.entry(VehicleProperty.LOW_SPEED_COLLISION_WARNING_ENABLED, VehiclePropertyAccess.READ_WRITE),
         Map.entry(VehicleProperty.LOW_SPEED_COLLISION_WARNING_STATE, VehiclePropertyAccess.READ),
-        Map.entry(VehicleProperty.CROSS_TRAFFIC_MONITORING_ENABLED, VehiclePropertyAccess.READ_WRITE)
+        Map.entry(VehicleProperty.CROSS_TRAFFIC_MONITORING_ENABLED, VehiclePropertyAccess.READ_WRITE),
+        Map.entry(VehicleProperty.CROSS_TRAFFIC_MONITORING_WARNING_STATE, VehiclePropertyAccess.READ)
     );
 
 }
diff --git a/automotive/vehicle/aidl/generated_lib/java/ChangeModeForVehicleProperty.java b/automotive/vehicle/aidl/generated_lib/java/ChangeModeForVehicleProperty.java
index 50e31d0..780eaa3 100644
--- a/automotive/vehicle/aidl/generated_lib/java/ChangeModeForVehicleProperty.java
+++ b/automotive/vehicle/aidl/generated_lib/java/ChangeModeForVehicleProperty.java
@@ -283,7 +283,8 @@
         Map.entry(VehicleProperty.DRIVER_DISTRACTION_WARNING, VehiclePropertyChangeMode.ON_CHANGE),
         Map.entry(VehicleProperty.LOW_SPEED_COLLISION_WARNING_ENABLED, VehiclePropertyChangeMode.ON_CHANGE),
         Map.entry(VehicleProperty.LOW_SPEED_COLLISION_WARNING_STATE, VehiclePropertyChangeMode.ON_CHANGE),
-        Map.entry(VehicleProperty.CROSS_TRAFFIC_MONITORING_ENABLED, VehiclePropertyChangeMode.ON_CHANGE)
+        Map.entry(VehicleProperty.CROSS_TRAFFIC_MONITORING_ENABLED, VehiclePropertyChangeMode.ON_CHANGE),
+        Map.entry(VehicleProperty.CROSS_TRAFFIC_MONITORING_WARNING_STATE, VehiclePropertyChangeMode.ON_CHANGE)
     );
 
 }
diff --git a/automotive/vehicle/aidl/generated_lib/java/EnumForVehicleProperty.java b/automotive/vehicle/aidl/generated_lib/java/EnumForVehicleProperty.java
index b2ee4c0..b4f24a6 100644
--- a/automotive/vehicle/aidl/generated_lib/java/EnumForVehicleProperty.java
+++ b/automotive/vehicle/aidl/generated_lib/java/EnumForVehicleProperty.java
@@ -102,7 +102,8 @@
         Map.entry(VehicleProperty.DRIVER_DROWSINESS_ATTENTION_WARNING, List.of(DriverDrowsinessAttentionWarning.class, ErrorState.class)),
         Map.entry(VehicleProperty.DRIVER_DISTRACTION_STATE, List.of(DriverDistractionState.class, ErrorState.class)),
         Map.entry(VehicleProperty.DRIVER_DISTRACTION_WARNING, List.of(DriverDistractionWarning.class, ErrorState.class)),
-        Map.entry(VehicleProperty.LOW_SPEED_COLLISION_WARNING_STATE, List.of(LowSpeedCollisionWarningState.class, ErrorState.class))
+        Map.entry(VehicleProperty.LOW_SPEED_COLLISION_WARNING_STATE, List.of(LowSpeedCollisionWarningState.class, ErrorState.class)),
+        Map.entry(VehicleProperty.CROSS_TRAFFIC_MONITORING_WARNING_STATE, List.of(CrossTrafficMonitoringWarningState.class, ErrorState.class))
     );
 
 }
diff --git a/automotive/vehicle/aidl/impl/default_config/JsonConfigLoader/src/JsonConfigLoader.cpp b/automotive/vehicle/aidl/impl/default_config/JsonConfigLoader/src/JsonConfigLoader.cpp
index 371acbe..146da69 100644
--- a/automotive/vehicle/aidl/impl/default_config/JsonConfigLoader/src/JsonConfigLoader.cpp
+++ b/automotive/vehicle/aidl/impl/default_config/JsonConfigLoader/src/JsonConfigLoader.cpp
@@ -38,6 +38,7 @@
 using ::aidl::android::hardware::automotive::vehicle::AutomaticEmergencyBrakingState;
 using ::aidl::android::hardware::automotive::vehicle::BlindSpotWarningState;
 using ::aidl::android::hardware::automotive::vehicle::ChangeModeForVehicleProperty;
+using ::aidl::android::hardware::automotive::vehicle::CrossTrafficMonitoringWarningState;
 using ::aidl::android::hardware::automotive::vehicle::CruiseControlCommand;
 using ::aidl::android::hardware::automotive::vehicle::CruiseControlState;
 using ::aidl::android::hardware::automotive::vehicle::CruiseControlType;
@@ -294,6 +295,8 @@
             std::make_unique<ConstantParser<LowSpeedCollisionWarningState>>();
     mConstantParsersByType["ElectronicStabilityControlState"] =
             std::make_unique<ConstantParser<ElectronicStabilityControlState>>();
+    mConstantParsersByType["CrossTrafficMonitoringWarningState"] =
+            std::make_unique<ConstantParser<CrossTrafficMonitoringWarningState>>();
     mConstantParsersByType["Constants"] = std::make_unique<LocalVariableParser>();
 #ifdef ENABLE_VEHICLE_HAL_TEST_PROPERTIES
     mConstantParsersByType["TestVendorProperty"] =
diff --git a/automotive/vehicle/aidl/impl/default_config/config/DefaultProperties.json b/automotive/vehicle/aidl/impl/default_config/config/DefaultProperties.json
index ee325ff..3d026b4 100644
--- a/automotive/vehicle/aidl/impl/default_config/config/DefaultProperties.json
+++ b/automotive/vehicle/aidl/impl/default_config/config/DefaultProperties.json
@@ -4165,6 +4165,32 @@
                     1
                 ]
             }
+        },
+        {
+            "property": "VehicleProperty::CROSS_TRAFFIC_MONITORING_WARNING_STATE",
+            "defaultValue": {
+                "int32Values": [
+                    "CrossTrafficMonitoringWarningState::NO_WARNING"
+                ]
+            },
+            "areas": [
+                {
+                    "areaId": 0,
+                    "supportedEnumValues": [
+                        "ErrorState::NOT_AVAILABLE_SAFETY",
+                        "ErrorState::NOT_AVAILABLE_POOR_VISIBILITY",
+                        "ErrorState::NOT_AVAILABLE_SPEED_HIGH",
+                        "ErrorState::NOT_AVAILABLE_DISABLED",
+                        "CrossTrafficMonitoringWarningState::NO_WARNING",
+                        "CrossTrafficMonitoringWarningState::WARNING_FRONT_LEFT",
+                        "CrossTrafficMonitoringWarningState::WARNING_FRONT_RIGHT",
+                        "CrossTrafficMonitoringWarningState::WARNING_FRONT_BOTH",
+                        "CrossTrafficMonitoringWarningState::WARNING_REAR_LEFT",
+                        "CrossTrafficMonitoringWarningState::WARNING_REAR_RIGHT",
+                        "CrossTrafficMonitoringWarningState::WARNING_REAR_BOTH"
+                    ]
+                }
+            ]
         }
     ]
 }
diff --git a/automotive/vehicle/aidl/impl/fake_impl/hardware/src/FakeVehicleHardware.cpp b/automotive/vehicle/aidl/impl/fake_impl/hardware/src/FakeVehicleHardware.cpp
index 0c1e4b9..dc1e1e4 100644
--- a/automotive/vehicle/aidl/impl/fake_impl/hardware/src/FakeVehicleHardware.cpp
+++ b/automotive/vehicle/aidl/impl/fake_impl/hardware/src/FakeVehicleHardware.cpp
@@ -239,6 +239,13 @@
                         toInt(VehicleProperty::ELECTRONIC_STABILITY_CONTROL_STATE),
                 },
         },
+        // CTMW
+        {
+                toInt(VehicleProperty::CROSS_TRAFFIC_MONITORING_ENABLED),
+                {
+                        toInt(VehicleProperty::CROSS_TRAFFIC_MONITORING_WARNING_STATE),
+                },
+        },
 };
 }  // namespace
 
diff --git a/automotive/vehicle/aidl/impl/utils/common/include/VehicleHalTypes.h b/automotive/vehicle/aidl/impl/utils/common/include/VehicleHalTypes.h
index 8e990fc..bbd88da 100644
--- a/automotive/vehicle/aidl/impl/utils/common/include/VehicleHalTypes.h
+++ b/automotive/vehicle/aidl/impl/utils/common/include/VehicleHalTypes.h
@@ -19,6 +19,7 @@
 
 #include <aidl/android/hardware/automotive/vehicle/AutomaticEmergencyBrakingState.h>
 #include <aidl/android/hardware/automotive/vehicle/BlindSpotWarningState.h>
+#include <aidl/android/hardware/automotive/vehicle/CrossTrafficMonitoringWarningState.h>
 #include <aidl/android/hardware/automotive/vehicle/CruiseControlCommand.h>
 #include <aidl/android/hardware/automotive/vehicle/CruiseControlState.h>
 #include <aidl/android/hardware/automotive/vehicle/CruiseControlType.h>
diff --git a/automotive/vehicle/aidl_property/aidl_api/android.hardware.automotive.vehicle.property/current/android/hardware/automotive/vehicle/CrossTrafficMonitoringWarningState.aidl b/automotive/vehicle/aidl_property/aidl_api/android.hardware.automotive.vehicle.property/current/android/hardware/automotive/vehicle/CrossTrafficMonitoringWarningState.aidl
new file mode 100644
index 0000000..90e2d8d
--- /dev/null
+++ b/automotive/vehicle/aidl_property/aidl_api/android.hardware.automotive.vehicle.property/current/android/hardware/automotive/vehicle/CrossTrafficMonitoringWarningState.aidl
@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL file. Do not edit it manually. There are
+// two cases:
+// 1). this is a frozen version file - do not edit this in any case.
+// 2). this is a 'current' file. If you make a backwards compatible change to
+//     the interface (from the latest frozen version), the build system will
+//     prompt you to update this file with `m <name>-update-api`.
+//
+// You must not make a backward incompatible change to any AIDL file built
+// with the aidl_interface module type with versions property set. The module
+// type is used to build AIDL files in a way that they can be used across
+// independently updatable components of the system. If a device is shipped
+// with such a backward incompatible change, it has a high risk of breaking
+// later when a module using the interface is updated, e.g., Mainline modules.
+
+package android.hardware.automotive.vehicle;
+@Backing(type="int") @VintfStability
+enum CrossTrafficMonitoringWarningState {
+  OTHER = 0,
+  NO_WARNING = 1,
+  WARNING_FRONT_LEFT = 2,
+  WARNING_FRONT_RIGHT = 3,
+  WARNING_FRONT_BOTH = 4,
+  WARNING_REAR_LEFT = 5,
+  WARNING_REAR_RIGHT = 6,
+  WARNING_REAR_BOTH = 7,
+}
diff --git a/automotive/vehicle/aidl_property/aidl_api/android.hardware.automotive.vehicle.property/current/android/hardware/automotive/vehicle/VehicleProperty.aidl b/automotive/vehicle/aidl_property/aidl_api/android.hardware.automotive.vehicle.property/current/android/hardware/automotive/vehicle/VehicleProperty.aidl
index 0afd002..b6bfb04 100644
--- a/automotive/vehicle/aidl_property/aidl_api/android.hardware.automotive.vehicle.property/current/android/hardware/automotive/vehicle/VehicleProperty.aidl
+++ b/automotive/vehicle/aidl_property/aidl_api/android.hardware.automotive.vehicle.property/current/android/hardware/automotive/vehicle/VehicleProperty.aidl
@@ -290,4 +290,5 @@
   LOW_SPEED_COLLISION_WARNING_ENABLED = (((0x1021 + android.hardware.automotive.vehicle.VehiclePropertyGroup.SYSTEM) + android.hardware.automotive.vehicle.VehicleArea.GLOBAL) + android.hardware.automotive.vehicle.VehiclePropertyType.BOOLEAN) /* 287313953 */,
   LOW_SPEED_COLLISION_WARNING_STATE = (((0x1022 + android.hardware.automotive.vehicle.VehiclePropertyGroup.SYSTEM) + android.hardware.automotive.vehicle.VehicleArea.GLOBAL) + android.hardware.automotive.vehicle.VehiclePropertyType.INT32) /* 289411106 */,
   CROSS_TRAFFIC_MONITORING_ENABLED = (((0x1023 + android.hardware.automotive.vehicle.VehiclePropertyGroup.SYSTEM) + android.hardware.automotive.vehicle.VehicleArea.GLOBAL) + android.hardware.automotive.vehicle.VehiclePropertyType.BOOLEAN) /* 287313955 */,
+  CROSS_TRAFFIC_MONITORING_WARNING_STATE = (((0x1024 + android.hardware.automotive.vehicle.VehiclePropertyGroup.SYSTEM) + android.hardware.automotive.vehicle.VehicleArea.GLOBAL) + android.hardware.automotive.vehicle.VehiclePropertyType.INT32) /* 289411108 */,
 }
diff --git a/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/CrossTrafficMonitoringWarningState.aidl b/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/CrossTrafficMonitoringWarningState.aidl
new file mode 100644
index 0000000..05be65d
--- /dev/null
+++ b/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/CrossTrafficMonitoringWarningState.aidl
@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.hardware.automotive.vehicle;
+
+/**
+ * Used to enumerate the state of Cross Traffic Monitoring Warning system.
+ */
+@VintfStability
+@Backing(type="int")
+enum CrossTrafficMonitoringWarningState {
+
+    /**
+     * This state is used as an alternative to any CrossTrafficMonitoringWarningState value that is
+     * not defined in the platform. Ideally, implementations of
+     * VehicleProperty#CROSS_TRAFFIC_MONITORING_WARNING_STATE should not use this state. The
+     * framework can use this field to remain backwards compatible if
+     * CrossTrafficMonitoringWarningState is extended to include additional states.
+     */
+    OTHER = 0,
+    /**
+     * Cross Traffic Monitoring Warning is enabled and monitoring safety, but no potential collision
+     * is detected.
+     */
+    NO_WARNING = 1,
+    /**
+     * Cross Traffic Monitoring Warning is enabled and is actively warning the user of incoming
+     * moving objects coming from the driver's left side in front of the vehicle.
+     */
+    WARNING_FRONT_LEFT = 2,
+    /**
+     * Cross Traffic Monitoring Warning is enabled and is actively warning the user of incoming
+     * moving objects coming from the driver's right side in front of the vehicle.
+     */
+    WARNING_FRONT_RIGHT = 3,
+    /**
+     * Cross Traffic Monitoring Warning is enabled and is actively warning the user of incoming
+     * moving objects coming from both the driver's left side and the driver's right side in front
+     * of the vehicle.
+     */
+    WARNING_FRONT_BOTH = 4,
+    /**
+     * Cross Traffic Monitoring Warning is enabled and is actively warning the user of incoming
+     * moving objects coming from the driver's left side behind the vehicle.
+     */
+    WARNING_REAR_LEFT = 5,
+    /**
+     * Cross Traffic Monitoring Warning is enabled and is actively warning the user of incoming
+     * moving objects coming from the driver's right side behind the vehicle.
+     */
+    WARNING_REAR_RIGHT = 6,
+    /**
+     * Cross Traffic Monitoring Warning is enabled and is actively warning the user of incoming
+     * moving objects coming from the driver's left side and the driver's right side behind the
+     * vehicle.
+     */
+    WARNING_REAR_BOTH = 7,
+}
diff --git a/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/VehicleProperty.aidl b/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/VehicleProperty.aidl
index aa23ac6..ecabe8c 100644
--- a/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/VehicleProperty.aidl
+++ b/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/VehicleProperty.aidl
@@ -5482,6 +5482,25 @@
     CROSS_TRAFFIC_MONITORING_ENABLED =
             0x1023 + VehiclePropertyGroup.SYSTEM + VehicleArea.GLOBAL + VehiclePropertyType.BOOLEAN,
 
+    /**
+     * Cross Traffic Monitoring warning state.
+     *
+     * Returns the current state of Cross Traffic Monitoring Warning. This property must always
+     * return a valid state defined in CrossTrafficMonitoringWarningState or ErrorState. It must not
+     * surface errors through StatusCode and must use the supported error states instead.
+     *
+     * For the global area ID (0), the VehicleAreaConfig#supportedEnumValues array must be defined
+     * unless all states of both CrossTrafficMonitoringWarningState (including OTHER, which is not
+     * recommended) and ErrorState are supported.
+     *
+     * @change_mode VehiclePropertyChangeMode.ON_CHANGE
+     * @access VehiclePropertyAccess.READ
+     * @data_enum CrossTrafficMonitoringWarningState
+     * @data_enum ErrorState
+     */
+    CROSS_TRAFFIC_MONITORING_WARNING_STATE =
+            0x1024 + VehiclePropertyGroup.SYSTEM + VehicleArea.GLOBAL + VehiclePropertyType.INT32,
+
     /***************************************************************************
      * End of ADAS Properties
      **************************************************************************/
diff --git a/automotive/vehicle/vts/src/VtsHalAutomotiveVehicle_TargetTest.cpp b/automotive/vehicle/vts/src/VtsHalAutomotiveVehicle_TargetTest.cpp
index 7191f9d..ba36f29 100644
--- a/automotive/vehicle/vts/src/VtsHalAutomotiveVehicle_TargetTest.cpp
+++ b/automotive/vehicle/vts/src/VtsHalAutomotiveVehicle_TargetTest.cpp
@@ -1005,6 +1005,12 @@
                    VehiclePropertyGroup::SYSTEM, VehicleArea::GLOBAL, VehiclePropertyType::BOOLEAN);
 }
 
+TEST_P(VtsHalAutomotiveVehicleTargetTest, verifyCrossTrafficMonitoringWarningStateConfig) {
+    verifyProperty(VehicleProperty::CROSS_TRAFFIC_MONITORING_WARNING_STATE,
+                   VehiclePropertyAccess::READ, VehiclePropertyChangeMode::ON_CHANGE,
+                   VehiclePropertyGroup::SYSTEM, VehicleArea::GLOBAL, VehiclePropertyType::INT32);
+}
+
 bool VtsHalAutomotiveVehicleTargetTest::checkIsSupported(int32_t propertyId) {
     auto result = mVhalClient->getPropConfigs({propertyId});
     return result.ok();