diff --git a/api/obs/api/routes/mapdetails.py b/api/obs/api/routes/mapdetails.py
index 2c9ce59..fc475d7 100644
--- a/api/obs/api/routes/mapdetails.py
+++ b/api/obs/api/routes/mapdetails.py
@@ -108,7 +108,7 @@ async def mapdetails_road(req):
     def partition(arr, cond):
         return arr[:, cond], arr[:, ~cond]
 
-    forwards, backwards = partition(data, mask)
+    forwards, backwards = partition(data, ~mask)
     print("for", forwards.dtype, "back", backwards.dtype)
 
     def array_stats(arr, rounder):
diff --git a/tile-generator/layers/obs_roads/layer.sql b/tile-generator/layers/obs_roads/layer.sql
index 181bf15..85f700a 100644
--- a/tile-generator/layers/obs_roads/layer.sql
+++ b/tile-generator/layers/obs_roads/layer.sql
@@ -24,7 +24,7 @@ RETURNS TABLE(
       r.dir as direction,
       case when road.directionality = 0 then r.dir else 0 end as offset_direction
     FROM road
-    LEFT JOIN (VALUES (1, TRUE), (-1, FALSE), (0, FALSE)) AS r(dir, rev) ON (abs(r.dir) != road.directionality)
+    LEFT JOIN (VALUES (-1, TRUE), (1, FALSE), (0, FALSE)) AS r(dir, rev) ON (abs(r.dir) != road.directionality)
     FULL OUTER JOIN overtaking_event ON (road.way_id = overtaking_event.way_id and (road.directionality != 0 or overtaking_event.direction_reversed = r.rev))
     -- WHERE road.name = 'Merzhauser Straße'
     WHERE road.geometry && bbox