diff --git a/back/data.js b/back/data.js
index 176879f..3eab080 100644
--- a/back/data.js
+++ b/back/data.js
@@ -123,7 +123,7 @@ out body qt;
             const currentStop = stops[currentStopIndex];
             const nextStop = stops[currentStopIndex + 1];
 
-            const visited = new Set();
+            const visitedEdges = new Set();
             const stack = [{
                 currentNode: currentStop.id,
                 way: [currentStop.id],
@@ -134,7 +134,6 @@ out body qt;
             while (stack.length !== 0)
             {
                 const {currentNode, way} = stack.pop();
-                visited.add(currentNode);
 
                 if (currentNode === nextStop.id)
                 {
@@ -148,8 +147,11 @@ out body qt;
 
                 for (let nextNode of neighbors)
                 {
-                    if (!visited.has(nextNode))
+                    const edge = `${currentNode}-${nextNode}`;
+
+                    if (!visitedEdges.has(edge))
                     {
+                        visitedEdges.add(edge);
                         stack.push({
                             currentNode: nextNode,
                             way: way.concat([nextNode]),