diff --git a/back/data.js b/back/data.js
index 3eab080..f7275a5 100644
--- a/back/data.js
+++ b/back/data.js
@@ -79,8 +79,14 @@ out body qt;
         for (let id of rawWays)
         {
             const {type, nodes, tags} = elements[id];
+
+            const isOneWay = (
+                tags.oneway === 'yes'
+                || tags.junction === 'roundabout'
+            );
+
             const canGoBackward = (
-                tags.oneway !== 'yes'
+                !isOneWay
                 || parseInt(tags['lanes:psv:backward'], 10) > 0
             );