diff --git a/python_scripts/add_trees_to_open_street_map/add_trees.py b/python_scripts/add_trees_to_open_street_map/add_trees.py
index e2479c924cc3464455c8c54cb9c44979d0409ff5..46f734854aa3dd7c5e977d9ac2baaee23750ec75 100644
--- a/python_scripts/add_trees_to_open_street_map/add_trees.py
+++ b/python_scripts/add_trees_to_open_street_map/add_trees.py
@@ -109,17 +109,19 @@ def set_plot(bounds: Bounds, to_local_coordinates):
     return ax
 
 
-def get_default_widths(ways: list) -> dict[str, float] :
+def get_default_widths(ways: list) -> dict[str, float]:
     """Check existing OSM highways, and extract the most common width for each type"""
     width_counters = {}
     for way in ways:
-        width = float(way.tags.get("width", 0))
+        # NOTE: Some widths are written with units, so try to remove [m] first.
+        # TODO: use regex instead
+        width = float(way.tags.get("width", '0').replace('m', ''))
         way_type = way.tags.get("highway")
         if width:
             if way_type not in width_counters:
                 width_counters[way_type] = Counter()
             width_counters[way_type][width] += 1
-    return {w:c.most_common(1)[0][0] for w, c in width_counters.items()}
+    return {w: c.most_common(1)[0][0] for w, c in width_counters.items()}
 
 
 def place_trees(forest: Forest, ways: list, region: str, to_local, tree_distance: float, min_distance_2: float) -> Forest: