diff --git a/convert_osm/src/osm_reader.rs b/convert_osm/src/osm_reader.rs
index e404dbab87..7b1c04f3cc 100644
--- a/convert_osm/src/osm_reader.rs
+++ b/convert_osm/src/osm_reader.rs
@@ -341,6 +341,9 @@ pub fn extract_osm(
                         shop.clone(),
                     ));
                 }
+                if pts.len() < 3 {
+                    continue;
+                }
                 map.buildings.insert(
                     OriginalBuilding { osm_way_id: rel.id },
                     RawBuilding {
diff --git a/data/geojson_to_osmosis.py b/data/geojson_to_osmosis.py
index 846b38e742..02234aa768 100755
--- a/data/geojson_to_osmosis.py
+++ b/data/geojson_to_osmosis.py
@@ -50,5 +50,9 @@ coordinates = [
     47.718885924932174
   ]
 ]
+print('map_name')
+print('1')
 for (x, y) in coordinates:
   print('     {}    {}'.format(x, y))
+print('END')
+print('END')
diff --git a/data/other_polygons/manhattan.poly b/data/other_polygons/manhattan.poly
new file mode 100644
index 0000000000..058513480f
--- /dev/null
+++ b/data/other_polygons/manhattan.poly
@@ -0,0 +1,15 @@
+manhattan
+1
+     -74.02373313903809    40.69625781921317
+     -74.01025772094727    40.699218658976555
+     -73.99995803833008    40.703122861875606
+     -73.9739513397217    40.7105727473657
+     -73.96159172058105    40.7519385984599
+     -73.9400053024292    40.77612179824107
+     -73.94030570983887    40.78057392807732
+     -73.93798828125    40.78483079505022
+     -73.96742820739748    40.822383381646446
+     -74.01686668395996    40.75219867966512
+     -74.02373313903809    40.69625781921317
+END
+END
diff --git a/map_model/src/lane.rs b/map_model/src/lane.rs
index f2c19b475e..64b7d645b7 100644
--- a/map_model/src/lane.rs
+++ b/map_model/src/lane.rs
@@ -216,7 +216,7 @@ impl Lane {
         Some(
             part.split(';')
                 .flat_map(|s| match s {
-                    "left" => vec![TurnType::Left],
+                    "left" | "left\\left" => vec![TurnType::Left],
                     "right" => vec![TurnType::Right],
                     // TODO What is blank supposed to mean? From few observed cases, same as through
                     "through" | "" => vec![