diff --git a/backend/src/lib.rs b/backend/src/lib.rs
index 4da855a..a03b4b3 100644
--- a/backend/src/lib.rs
+++ b/backend/src/lib.rs
@@ -154,14 +154,20 @@ impl LTN {
     }
 
     #[wasm_bindgen(js_name = setCurrentNeighbourhood)]
-    pub fn set_current_neighbourhood(&mut self, name: String) -> Result<(), JsValue> {
+    pub fn set_current_neighbourhood(
+        &mut self,
+        name: String,
+        edit_perimeter_roads: bool,
+    ) -> Result<(), JsValue> {
         info!("setCurrentNeighbourhood");
         let boundary_gj = self.map.boundaries.get(&name).cloned().unwrap();
         let mut boundary_geo: Polygon = boundary_gj.try_into().map_err(err_to_js)?;
         self.map.mercator.to_mercator_in_place(&mut boundary_geo);
 
-        self.neighbourhood =
-            Some(Neighbourhood::new(&self.map, name, boundary_geo).map_err(err_to_js)?);
+        self.neighbourhood = Some(
+            Neighbourhood::new(&self.map, name, boundary_geo, edit_perimeter_roads)
+                .map_err(err_to_js)?,
+        );
         info!("done");
         Ok(())
     }
@@ -175,7 +181,7 @@ impl LTN {
                 x: pos.lng,
                 y: pos.lat,
             }),
-            Some(&self.neighbourhood.as_ref().unwrap().interior_roads),
+            Some(self.neighbourhood.as_ref().unwrap().editable_roads()),
             FilterKind::from_string(&kind).unwrap(),
         );
         self.after_edit();
diff --git a/backend/src/map_model.rs b/backend/src/map_model.rs
index ec6cd22..1949b3c 100644
--- a/backend/src/map_model.rs
+++ b/backend/src/map_model.rs
@@ -118,7 +118,7 @@ impl MapModel {
     pub fn add_modal_filter(
         &mut self,
         pt: Coord,
-        candidate_roads: Option<&BTreeSet<RoadID>>,
+        candidate_roads: Option<Vec<RoadID>>,
         kind: FilterKind,
     ) {
         let cmd = self.do_edit(self.add_modal_filter_cmd(pt, candidate_roads, kind));
@@ -130,7 +130,7 @@ impl MapModel {
     fn add_modal_filter_cmd(
         &self,
         pt: Coord,
-        candidate_roads: Option<&BTreeSet<RoadID>>,
+        candidate_roads: Option<Vec<RoadID>>,
         kind: FilterKind,
     ) -> Command {
         let (r, percent_along) = self.closest_point_on_road(pt, candidate_roads).unwrap();
@@ -146,18 +146,16 @@ impl MapModel {
     fn closest_point_on_road(
         &self,
         click_pt: Coord,
-        candidate_roads: Option<&BTreeSet<RoadID>>,
+        candidate_roads: Option<Vec<RoadID>>,
     ) -> Option<(RoadID, f64)> {
         // If candidate_roads is not specified, search around the point with a generous buffer
-        let roads: Vec<RoadID> = if let Some(set) = candidate_roads {
-            set.iter().cloned().collect()
-        } else {
+        let roads = candidate_roads.unwrap_or_else(|| {
             let bbox = buffer_aabb(AABB::from_point(click_pt.into()), 50.0);
             self.closest_road
                 .locate_in_envelope_intersecting(&bbox)
                 .map(|r| r.data)
                 .collect()
-        };
+        });
 
         roads
             .into_iter()
diff --git a/backend/src/neighbourhood.rs b/backend/src/neighbourhood.rs
index 3ec39c0..ae62989 100644
--- a/backend/src/neighbourhood.rs
+++ b/backend/src/neighbourhood.rs
@@ -22,6 +22,9 @@ pub struct Neighbourhood {
     // Mercator
     pub boundary_polygon: Polygon,
     boundary_area_km2: f64,
+    /// If true, shortcuts across perimeter roads will be calculated, and the user can edit these
+    /// roads.
+    pub edit_perimeter_roads: bool,
 
     // Updated after mutations
     derived: Option<DerivedNeighbourhoodState>,
@@ -33,7 +36,12 @@ struct DerivedNeighbourhoodState {
 }
 
 impl Neighbourhood {
-    pub fn new(map: &MapModel, name: String, boundary_polygon: Polygon) -> Result<Self> {
+    pub fn new(
+        map: &MapModel,
+        name: String,
+        boundary_polygon: Polygon,
+        edit_perimeter_roads: bool,
+    ) -> Result<Self> {
         info!("match roads");
         let bbox = buffer_aabb(aabb(&boundary_polygon), 50.0);
 
@@ -88,6 +96,7 @@ impl Neighbourhood {
             name,
             boundary_polygon,
             boundary_area_km2,
+            edit_perimeter_roads,
             derived: None,
         };
         n.after_edit(map);
@@ -111,6 +120,18 @@ impl Neighbourhood {
         }
     }
 
+    pub fn editable_roads(&self) -> Vec<RoadID> {
+        if self.edit_perimeter_roads {
+            self.interior_roads
+                .iter()
+                .chain(self.crosses.keys())
+                .cloned()
+                .collect()
+        } else {
+            self.interior_roads.iter().cloned().collect()
+        }
+    }
+
     pub fn to_gj(&self, map: &MapModel) -> FeatureCollection {
         let mut features = Vec::new();
 
@@ -119,8 +140,8 @@ impl Neighbourhood {
         // Just one boundary
         features.push(map.boundaries.get(&self.name).cloned().unwrap());
 
-        for r in &self.interior_roads {
-            let road = map.get_r(*r);
+        for r in self.editable_roads() {
+            let road = map.get_r(r);
             let mut f = road.to_gj(&map.mercator);
             f.set_property("kind", "interior_road");
             f.set_property(
@@ -128,18 +149,20 @@ impl Neighbourhood {
                 derived
                     .shortcuts
                     .count_per_road
-                    .get(r)
+                    .get(&r)
                     .cloned()
                     .unwrap_or(0),
             );
-            f.set_property("direction", map.directions[r].to_string());
+            f.set_property("direction", map.directions[&r].to_string());
             f.set_property(
                 "direction_edited",
-                map.directions[r] != Direction::from_osm(&road.tags),
+                map.directions[&r] != Direction::from_osm(&road.tags),
             );
             f.set_property("road", r.0);
             features.push(f);
         }
+
+        // Only for debugging
         for (r, pct) in &self.crosses {
             let mut f = map.get_r(*r).to_gj(&map.mercator);
             f.set_property("kind", "crosses");
diff --git a/backend/src/shortcuts.rs b/backend/src/shortcuts.rs
index 9ed6ad3..0bd9702 100644
--- a/backend/src/shortcuts.rs
+++ b/backend/src/shortcuts.rs
@@ -22,11 +22,11 @@ impl Shortcuts {
         let mut input_graph = InputGraph::new();
         let mut node_map = NodeMap::new();
 
-        for r in &neighbourhood.interior_roads {
-            if map.modal_filters.contains_key(r) {
+        for r in neighbourhood.editable_roads() {
+            if map.modal_filters.contains_key(&r) {
                 continue;
             }
-            let road = map.get_r(*r);
+            let road = map.get_r(r);
             // Loops can't be part of a shortest path
             if road.src_i == road.dst_i {
                 continue;
@@ -35,7 +35,7 @@ impl Shortcuts {
             let i1 = node_map.get_or_insert(road.src_i);
             let i2 = node_map.get_or_insert(road.dst_i);
             let cost = (road.length() * 100.0) as usize;
-            match map.directions[r] {
+            match map.directions[&r] {
                 Direction::Forwards => {
                     input_graph.add_edge(i1, i2, cost);
                 }
diff --git a/backend/src/tests.rs b/backend/src/tests.rs
index 9702e31..c4983ed 100644
--- a/backend/src/tests.rs
+++ b/backend/src/tests.rs
@@ -50,7 +50,13 @@ fn get_gj(study_area_name: &str, savefile_name: &str, neighbourhood_name: &str)
     let boundary_gj = map.boundaries.get(neighbourhood_name).cloned().unwrap();
     let mut boundary_geo: Polygon = boundary_gj.try_into()?;
     map.mercator.to_mercator_in_place(&mut boundary_geo);
-    let neighbourhood = Neighbourhood::new(&map, neighbourhood_name.to_string(), boundary_geo)?;
+    let edit_perimeter_roads = false;
+    let neighbourhood = Neighbourhood::new(
+        &map,
+        neighbourhood_name.to_string(),
+        boundary_geo,
+        edit_perimeter_roads,
+    )?;
 
     let mut gj = prune_features(neighbourhood.to_gj(&map));
 
@@ -59,6 +65,7 @@ fn get_gj(study_area_name: &str, savefile_name: &str, neighbourhood_name: &str)
         f.set_property("kind", "existing_modal_filter");
         f.remove_property("road");
         f.remove_property("edited");
+        f.remove_property("angle");
         gj.features.push(f);
     }
 
@@ -85,6 +92,7 @@ fn prune_features(mut gj: FeatureCollection) -> FeatureCollection {
                     "way",
                 ]
                 .contains(&k.as_str())
+                    && k != "angle"
             });
         }
     }
diff --git a/web/src/AutoBoundariesMode.svelte b/web/src/AutoBoundariesMode.svelte
index 1858313..975ae62 100644
--- a/web/src/AutoBoundariesMode.svelte
+++ b/web/src/AutoBoundariesMode.svelte
@@ -11,7 +11,7 @@
   import { Link, Popup, layerId } from "./common";
   import { isLine, isPolygon } from "svelte-utils/map";
   import { SplitComponent } from "svelte-utils/top_bar_layout";
-  import { app, mode, autosave } from "./stores";
+  import { app, mode, autosave, editPerimeterRoads } from "./stores";
   import { downloadGeneratedFile } from "svelte-utils";
   import { pickNeighbourhoodName } from "./common/pick_names";
 
@@ -38,7 +38,7 @@
       };
       $app!.setNeighbourhoodBoundary(name, feature);
       autosave();
-      $app!.setCurrentNeighbourhood(name);
+      $app!.setCurrentNeighbourhood(name, $editPerimeterRoads);
       $mode = {
         mode: "neighbourhood",
       };
diff --git a/web/src/NetworkMode.svelte b/web/src/NetworkMode.svelte
index 50b440c..cd029d8 100644
--- a/web/src/NetworkMode.svelte
+++ b/web/src/NetworkMode.svelte
@@ -7,7 +7,13 @@
   import { layerId, Popup, Link, HelpButton } from "./common";
   import ModalFilterLayer from "./ModalFilterLayer.svelte";
   import { SplitComponent } from "svelte-utils/top_bar_layout";
-  import { app, autosave, mode, projectName } from "./stores";
+  import {
+    app,
+    autosave,
+    mode,
+    projectName,
+    editPerimeterRoads,
+  } from "./stores";
   import { pickNeighbourhoodName } from "./common/pick_names";
 
   // Note we do this to trigger a refresh when loading stuff
@@ -17,7 +23,7 @@
     .map((f: Feature) => f.properties!.name);
 
   function pickNeighbourhood(name: string) {
-    $app!.setCurrentNeighbourhood(name);
+    $app!.setCurrentNeighbourhood(name, $editPerimeterRoads);
     $mode = { mode: "neighbourhood" };
   }
 
diff --git a/web/src/SetBoundaryMode.svelte b/web/src/SetBoundaryMode.svelte
index 1e82f29..08faea6 100644
--- a/web/src/SetBoundaryMode.svelte
+++ b/web/src/SetBoundaryMode.svelte
@@ -4,7 +4,7 @@
   import { notNull } from "svelte-utils";
   import AreaControls from "./common/draw_area/AreaControls.svelte";
   import { calculateArea, waypoints } from "./common/draw_area/stores";
-  import { autosave, app, mode, map } from "./stores";
+  import { autosave, app, mode, map, editPerimeterRoads } from "./stores";
   import type { AreaProps } from "route-snapper-ts";
 
   export let name: string;
@@ -36,7 +36,7 @@
         let feature = calculateArea($waypoints);
         $app!.setNeighbourhoodBoundary(name, feature);
         autosave();
-        $app!.setCurrentNeighbourhood(name);
+        $app!.setCurrentNeighbourhood(name, $editPerimeterRoads);
         $mode = {
           mode: "neighbourhood",
         };
diff --git a/web/src/edit/NeighbourhoodMode.svelte b/web/src/edit/NeighbourhoodMode.svelte
index 6dfad86..721f993 100644
--- a/web/src/edit/NeighbourhoodMode.svelte
+++ b/web/src/edit/NeighbourhoodMode.svelte
@@ -16,6 +16,7 @@
     filterType,
     autosave,
     animateShortcuts,
+    editPerimeterRoads,
   } from "../stores";
   import ChangeModalFilter from "./ChangeModalFilter.svelte";
   import FreehandLine from "./FreehandLine.svelte";
@@ -68,6 +69,14 @@
     autosave();
   }
 
+  function recalculateNeighbourhoodDefinition() {
+    $app!.setCurrentNeighbourhood(
+      boundary!.properties.name,
+      $editPerimeterRoads,
+    );
+    $mutationCounter++;
+  }
+
   function onClickLine(f: Feature, pt: LngLat) {
     if (action == "filter") {
       $app!.addModalFilter(pt, $filterType);
@@ -239,6 +248,15 @@
       Animate shortcuts
     </label>
 
+    <label>
+      <input
+        type="checkbox"
+        bind:checked={$editPerimeterRoads}
+        on:change={recalculateNeighbourhoodDefinition}
+      />
+      Include perimeter roads
+    </label>
+
     <div style="display: flex; justify-content: space-between;">
       <button disabled={undoLength == 0} on:click={undo} data-tooltip="Ctrl+Z">
         {#if undoLength == 0}
diff --git a/web/src/stores.ts b/web/src/stores.ts
index ded11cd..d816214 100644
--- a/web/src/stores.ts
+++ b/web/src/stores.ts
@@ -56,6 +56,7 @@ export let mutationCounter: Writable<number> = writable(1);
 export let mode: Writable<Mode> = writable({ mode: "title" });
 export let filterType: Writable<string> = writable("walk_cycle_only");
 export let animateShortcuts = writable(false);
+export let editPerimeterRoads = writable(false);
 
 export function autosave() {
   let key = get(projectName);