diff --git a/backend/src/lib.rs b/backend/src/lib.rs
index af8cdf4..95761ea 100644
--- a/backend/src/lib.rs
+++ b/backend/src/lib.rs
@@ -201,11 +201,10 @@ impl MapModel {
             self.graph
                 .mercator
                 .to_mercator_in_place(&mut input.geometry);
-            routes.push(
-                self.graph
-                    .snap_route(&input.geometry, mode)
-                    .map_err(err_to_js)?,
-            );
+            match self.graph.snap_route(&input.geometry, mode) {
+                Ok(route) => routes.push(route),
+                Err(err) => log::warn!("Couldn't snap a route: {err}"),
+            }
         }
 
         let start_time = NaiveTime::parse_from_str(&req.start_time, "%H:%M").map_err(err_to_js)?;
diff --git a/web/src/UploadRouteMode.svelte b/web/src/UploadRouteMode.svelte
index 6cf984d..4bf1464 100644
--- a/web/src/UploadRouteMode.svelte
+++ b/web/src/UploadRouteMode.svelte
@@ -20,6 +20,9 @@
   let output: FeatureCollection | null = null;
   let totalPopulationInBuffer = 0;
 
+  let showInput = true;
+  let showOutput = true;
+
   let fileInput: HTMLInputElement;
   async function loadFile(e: Event) {
     try {
@@ -78,6 +81,15 @@
       <input bind:this={fileInput} on:change={loadFile} type="file" />
     </label>
 
+    <label style:color="cyan">
+      <input type="checkbox" bind:checked={showInput} />
+      Show input
+    </label>
+    <label style:color="red">
+      <input type="checkbox" bind:checked={showOutput} />
+      Show snapped output
+    </label>
+
     <PickTravelMode bind:travelMode={$travelMode} />
 
     {#if input}
@@ -100,6 +112,9 @@
     {#if input}
       <GeoJSON data={input} generateId>
         <LineLayer
+          layout={{
+            visibility: showInput ? "visible" : "none",
+          }}
           paint={{
             "line-width": 20,
             "line-color": "cyan",
@@ -117,6 +132,9 @@
         {:else}
           <LineLayer
             filter={["==", ["get", "kind"], "route"]}
+            layout={{
+              visibility: showOutput ? "visible" : "none",
+            }}
             paint={{
               "line-width": 20,
               "line-color": "red",