diff --git a/traffic_control/resources/additional_sign.py b/traffic_control/resources/additional_sign.py
index a7c771b7..5d61fe47 100644
--- a/traffic_control/resources/additional_sign.py
+++ b/traffic_control/resources/additional_sign.py
@@ -277,22 +277,37 @@ def _content_s_from_row(self, row: OrderedDict, schema: Optional[dict], missing_
         return content_s or None
 
     def _content_s_to_columns(self, data: Dataset):
-        content_rows = data["content_s"]
+        """Assume that this is empty template export if there is no data.
+        In that case add all possible content_s fields as columns."""
+        if not data.dict:
+            device_types_schemas = list(
+                filter(
+                    lambda x: x is not None,
+                    TrafficControlDeviceType.objects.all().values_list("content_schema", flat=True),
+                )
+            )
+            content_properties = set()
+            for device_type_schema in device_types_schemas:
+                for property_name in device_type_schema.get("properties", {}).keys():
+                    content_properties.add(f"content_s.{property_name}")
+            data.headers.extend(list(content_properties))
 
-        # Collect all content_s properties names from every row.
-        # Use dict to retain properties order as they appear in data.
-        content_properties = {}
-        for row in content_rows:
-            for key in row:
-                content_properties[key] = None
+        else:
+            content_rows = data["content_s"]
+            # Collect all content_s properties names from every row.
+            # Use dict to retain properties order as they appear in data.
+            content_properties = {}
+            for row in content_rows:
+                for key in row:
+                    content_properties[key] = None
 
-        for property in content_properties:
-            values = self._get_values_for_property(property, content_rows)
+            for property in content_properties:
+                values = self._get_values_for_property(property, content_rows)
 
-            # Convert arrays and objects to JSON strings
-            values = self._structured_values_to_string(values)
+                # Convert arrays and objects to JSON strings
+                values = self._structured_values_to_string(values)
 
-            data.append_col(values, header=f"content_s.{property}")
+                data.append_col(values, header=f"content_s.{property}")
 
         del data["content_s"]
 
diff --git a/traffic_control/tests/test_import_export/test_additional_sign_import_export.py b/traffic_control/tests/test_import_export/test_additional_sign_import_export.py
index 12b153ec..c6e589be 100644
--- a/traffic_control/tests/test_import_export/test_additional_sign_import_export.py
+++ b/traffic_control/tests/test_import_export/test_additional_sign_import_export.py
@@ -145,6 +145,29 @@ def test__additional_sign_real__import(resource, model, factory, format):
 }
 
 
+@pytest.mark.parametrize("resource", (AdditionalSignRealResource, AdditionalSignPlanResource))
+@pytest.mark.django_db
+def test_additional_sign_template__export(resource):
+    """test template export, this happens when no data is provided."""
+    get_traffic_control_device_type(
+        code="type1",
+        target_model=DeviceTypeTargetModel.ADDITIONAL_SIGN,
+        content_schema=schema_1,
+    )
+    dataset = resource().export()
+    assert dataset.dict == []
+    # check that all content_s fields from schema_1 are present
+    assert "content_s.bool" in dataset.headers
+    assert "content_s.num" in dataset.headers
+    assert "content_s.int" in dataset.headers
+    assert "content_s.str" in dataset.headers
+    assert "content_s.str_nolimit" in dataset.headers
+    assert "content_s.enum" in dataset.headers
+    assert "content_s.obj" in dataset.headers
+    assert "content_s.list" in dataset.headers
+    assert "content_s.not_required" in dataset.headers
+
+
 @pytest.mark.parametrize(
     "resource, factory",
     (
@@ -262,6 +285,10 @@ def test__additional_sign__import__create_with_content(model, resource, factory,
     )
 
     dataset = get_import_dataset(resource, format=format, delete_columns=["id"])
+    # add content_s column that does not exist in the device type, it should just be ignored
+    dataset.dict[0]["content_s.does_not_exits_in_schema"] = "Some value"
+    dataset.dict[1]["content_s.does_not_exits_in_schema"] = "Some value"
+    dataset.dict[2]["content_s.does_not_exits_in_schema"] = "Some value"
     model.objects.all().delete()
 
     result = resource().import_data(dataset, raise_errors=True, collect_failed_rows=True)
@@ -542,6 +569,8 @@ def test__additional_sign__import__update_with_content(model, resource, factory,
     dataset = get_import_dataset(resource, format=format, delete_columns=deleted_columns)
     row = dataset.dict[0]
     row["content_s.str"] = "Other value"
+    # add content_s column that does not exist in the device type, it should just be ignored
+    row["content_s.does_not_exits_in_schema"] = "Some value"
     dataset.dict = [row]
 
     result = resource().import_data(dataset, raise_errors=False, collect_failed_rows=True)