diff --git a/homeassistant/components/here_travel_time/__init__.py b/homeassistant/components/here_travel_time/__init__.py
index ddfdc34ff69c..b9ffa3e4baa7 100644
--- a/homeassistant/components/here_travel_time/__init__.py
+++ b/homeassistant/components/here_travel_time/__init__.py
@@ -14,7 +14,6 @@ from homeassistant.const import (
     CONF_API_KEY,
     CONF_MODE,
     CONF_UNIT_SYSTEM,
-    CONF_UNIT_SYSTEM_IMPERIAL,
     LENGTH_METERS,
     LENGTH_MILES,
     Platform,
@@ -45,6 +44,7 @@ from .const import (
     CONF_ROUTE_MODE,
     DEFAULT_SCAN_INTERVAL,
     DOMAIN,
+    IMPERIAL_UNITS,
     NO_ROUTE_ERROR_MESSAGE,
     TRAFFIC_MODE_ENABLED,
     TRAVEL_MODES_VEHICLE,
@@ -178,7 +178,7 @@ class HereTravelTimeDataUpdateCoordinator(DataUpdateCoordinator):
             traffic_time: float = summary["baseTime"]
             if self.config.travel_mode in TRAVEL_MODES_VEHICLE:
                 traffic_time = summary["trafficTime"]
-            if self.config.units == CONF_UNIT_SYSTEM_IMPERIAL:
+            if self.config.units == IMPERIAL_UNITS:
                 # Convert to miles.
                 distance = DistanceConverter.convert(
                     distance, LENGTH_METERS, LENGTH_MILES
diff --git a/homeassistant/components/here_travel_time/config_flow.py b/homeassistant/components/here_travel_time/config_flow.py
index 54f164c43a7f..a0f1fbbeb8c5 100644
--- a/homeassistant/components/here_travel_time/config_flow.py
+++ b/homeassistant/components/here_travel_time/config_flow.py
@@ -15,8 +15,6 @@ from homeassistant.const import (
     CONF_MODE,
     CONF_NAME,
     CONF_UNIT_SYSTEM,
-    CONF_UNIT_SYSTEM_IMPERIAL,
-    CONF_UNIT_SYSTEM_METRIC,
 )
 from homeassistant.core import HomeAssistant, callback
 from homeassistant.data_entry_flow import FlowResult
@@ -43,6 +41,8 @@ from .const import (
     CONF_TRAFFIC_MODE,
     DEFAULT_NAME,
     DOMAIN,
+    IMPERIAL_UNITS,
+    METRIC_UNITS,
     ROUTE_MODE_FASTEST,
     ROUTE_MODES,
     TRAFFIC_MODE_ENABLED,
@@ -96,10 +96,10 @@ def default_options(hass: HomeAssistant) -> dict[str, str | None]:
         CONF_ROUTE_MODE: ROUTE_MODE_FASTEST,
         CONF_ARRIVAL_TIME: None,
         CONF_DEPARTURE_TIME: None,
-        CONF_UNIT_SYSTEM: CONF_UNIT_SYSTEM_METRIC,
+        CONF_UNIT_SYSTEM: METRIC_UNITS,
     }
     if hass.config.units is IMPERIAL_SYSTEM:
-        default[CONF_UNIT_SYSTEM] = CONF_UNIT_SYSTEM_IMPERIAL
+        default[CONF_UNIT_SYSTEM] = IMPERIAL_UNITS
     return default
 
 
diff --git a/homeassistant/components/here_travel_time/const.py b/homeassistant/components/here_travel_time/const.py
index b79e7b4e4cd4..ea0dc5c136ea 100644
--- a/homeassistant/components/here_travel_time/const.py
+++ b/homeassistant/components/here_travel_time/const.py
@@ -1,10 +1,4 @@
 """Constants for the HERE Travel Time integration."""
-from homeassistant.const import (
-    CONF_UNIT_SYSTEM,
-    CONF_UNIT_SYSTEM_IMPERIAL,
-    CONF_UNIT_SYSTEM_METRIC,
-)
-
 DOMAIN = "here_travel_time"
 DEFAULT_SCAN_INTERVAL = 300
 
@@ -65,14 +59,16 @@ ICONS = {
     TRAVEL_MODE_TRUCK: ICON_TRUCK,
 }
 
-UNITS = [CONF_UNIT_SYSTEM_METRIC, CONF_UNIT_SYSTEM_IMPERIAL]
+IMPERIAL_UNITS = "imperial"
+METRIC_UNITS = "metric"
+UNITS = [METRIC_UNITS, IMPERIAL_UNITS]
 
 ATTR_DURATION = "duration"
 ATTR_DISTANCE = "distance"
 ATTR_ORIGIN = "origin"
 ATTR_DESTINATION = "destination"
 
-ATTR_UNIT_SYSTEM = CONF_UNIT_SYSTEM
+ATTR_UNIT_SYSTEM = "unit_system"
 ATTR_TRAFFIC_MODE = CONF_TRAFFIC_MODE
 
 ATTR_DURATION_IN_TRAFFIC = "duration_in_traffic"
diff --git a/homeassistant/components/here_travel_time/sensor.py b/homeassistant/components/here_travel_time/sensor.py
index e1d8342df196..1ee0087eab7f 100644
--- a/homeassistant/components/here_travel_time/sensor.py
+++ b/homeassistant/components/here_travel_time/sensor.py
@@ -17,7 +17,6 @@ from homeassistant.const import (
     ATTR_LONGITUDE,
     CONF_MODE,
     CONF_NAME,
-    CONF_UNIT_SYSTEM_IMPERIAL,
     LENGTH_KILOMETERS,
     LENGTH_MILES,
     TIME_MINUTES,
@@ -41,6 +40,7 @@ from .const import (
     DOMAIN,
     ICON_CAR,
     ICONS,
+    IMPERIAL_UNITS,
 )
 
 SCAN_INTERVAL = timedelta(minutes=5)
@@ -216,6 +216,6 @@ class DistanceSensor(HERETravelTimeSensor):
     @property
     def native_unit_of_measurement(self) -> str | None:
         """Return the unit of measurement of the sensor."""
-        if self.coordinator.config.units == CONF_UNIT_SYSTEM_IMPERIAL:
+        if self.coordinator.config.units == IMPERIAL_UNITS:
             return LENGTH_MILES
         return LENGTH_KILOMETERS
diff --git a/tests/components/here_travel_time/test_sensor.py b/tests/components/here_travel_time/test_sensor.py
index 316563b20cf9..5cc4802d253d 100644
--- a/tests/components/here_travel_time/test_sensor.py
+++ b/tests/components/here_travel_time/test_sensor.py
@@ -16,7 +16,6 @@ from homeassistant.components.here_travel_time.const import (
     CONF_ORIGIN_LATITUDE,
     CONF_ORIGIN_LONGITUDE,
     CONF_ROUTE_MODE,
-    CONF_UNIT_SYSTEM,
     DOMAIN,
     ICON_BICYCLE,
     ICON_CAR,
@@ -41,6 +40,7 @@ from homeassistant.const import (
     CONF_API_KEY,
     CONF_MODE,
     CONF_NAME,
+    CONF_UNIT_SYSTEM,
     EVENT_HOMEASSISTANT_START,
     LENGTH_KILOMETERS,
     LENGTH_MILES,