diff --git a/drawing_to_fsd_layout/export.py b/drawing_to_fsd_layout/export.py
index 2f035c5..cbe6997 100644
--- a/drawing_to_fsd_layout/export.py
+++ b/drawing_to_fsd_layout/export.py
@@ -8,7 +8,7 @@
 from drawing_to_fsd_layout.common import FloatArrayNx2
 
 
-def export_json_string(edges_left: FloatArrayNx2, edges_right: FloatArrayNx2) -> str:
+def export_json_string(edges_left: FloatArrayNx2, edges_right: FloatArrayNx2, centerline: FloatArrayNx2) -> str:
     """
     Export the track edges to a JSON string that can be used in the FSD layout editor.
 
@@ -21,6 +21,9 @@ def export_json_string(edges_left: FloatArrayNx2, edges_right: FloatArrayNx2) ->
     """
     cones_x = np.concatenate((edges_left[:, 0], edges_right[:, 0])).tolist()
     cones_y = np.concatenate((edges_left[:, 1], edges_right[:, 1])).tolist()
+    centerline_x = centerline[:,0].tolist()
+    centerline_y = centerline[:,1].tolist()
+    centerline
     cones_color = (
         ["orange_big"]
         + ["blue"] * (len(edges_left) - 1)
@@ -31,6 +34,8 @@ def export_json_string(edges_left: FloatArrayNx2, edges_right: FloatArrayNx2) ->
         "x": cones_x,
         "y": cones_y,
         "color": cones_color,
+        "centerline_x": centerline_x,
+        "centerline_y": centerline_y
     }
 
     return json.dumps(obj)
@@ -225,6 +230,7 @@ def cones_to_lyt(
     world_name: Literal["BL4", "AU1", "AU2", "AU3", "WE3", "LA2"],
     cones_left: FloatArrayNx2,
     cones_right: FloatArrayNx2,
+    centerline: FloatArrayNx2
 ) -> bytes:
     offset = {
         "BL4": (-261, 124),
@@ -246,5 +252,6 @@ def cones_to_lyt(
         (cones_left[0], cones_right[0])
     )
 
+
     bytes_to_write = _traces_to_lyt_bytes(cones_per_type, offset)
     return bytes_to_write
diff --git a/streamlit_app.py b/streamlit_app.py
index 94482ef..f9cece8 100644
--- a/streamlit_app.py
+++ b/streamlit_app.py
@@ -11,6 +11,7 @@
 from drawing_to_fsd_layout.cone_placement import (
     calculate_min_track_width,
     decide_start_finish_line_position_and_direction,
+    estimate_centerline_from_edges,
     estimate_centerline_length,
     fix_edge_direction,
     place_cones,
@@ -254,7 +255,7 @@ def main() -> None:
         f" {centerline_length:.2f} m*"
     )
 
-    # centerline = estimate_centerline_from_edges(contour_a_splined, contour_b_splined)
+    centerline = estimate_centerline_from_edges(contour_a_splined, contour_b_splined)
 
     st.title("Place start/finish line")
 
@@ -357,6 +358,16 @@ def main() -> None:
         head_width=min_track_width,
     )
 
+
+    plt.plot(
+        *centerline.T,
+        "--",
+        c="red",
+        label="Centerline",
+        markersize=5,
+        markeredgecolor="red",
+    )
+
     plt.plot(
         *right_cones[1:].T,
         "o",
@@ -400,7 +411,7 @@ def main() -> None:
         st.info(
             "The JSON object has 3 keys: `x`, `y` and `color`. `x` and `y` are lists of floats representing the x and y coordinates of the cones. `color` is a list of strings representing the color of the cones. The colors are either `blue`, `yellow` or `orange_big`. The length of the three lists should be the same. The cones appear in the same order as the track direction. The first cone is the start/finish line. The cones are ordered in the direction of the track."
         )
-        json_string = export_json_string(left_cones, right_cones)
+        json_string = export_json_string(left_cones, right_cones, centerline)
         st.download_button(
             "Download JSON",
             json_string,
@@ -409,7 +420,7 @@ def main() -> None:
         )
     with tab_lfs:
         world_name = "LA2"
-        lyt_bytes = cones_to_lyt(world_name, left_cones, right_cones)
+        lyt_bytes = cones_to_lyt(world_name, left_cones, right_cones, centerline)
 
         filename = f"{world_name}_{track_name_normalized}.lyt"