<p><b>@bhousel</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/openstreetmap/openstreetmap-website/pull/1747#discussion_r167992830">app/assets/javascripts/index/directions.js</a>:</p>
<pre style='color:#555'>> @@ -137,13 +138,36 @@ OSM.Directions = function (map) {
     }
   });
 
-  function formatDistance(m) {
-    if (m < 1000) {
-      return Math.round(m) + "m";
-    } else if (m < 10000) {
-      return (m / 1000.0).toFixed(1) + "km";
+  $(".directions_form .distance_units a").on("click", function() {
+    $(".directions_form .distance_units a").removeClass("selected");
+    $(this).addClass("selected");
+    distanceUnits = $(this).data("unit");
+    getRoute();
+  });
+
+  function formatDistance(m, distanceUnits = "km") {
</pre>
<p>I'd avoid the ES6 Javascript here - it won't work on IE11.</p>

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