show trip ID

static/index.html

@@ -300,6 +300,6 @@
       </div>
     </div>
 
-    <script type="module" src="/js/main.js?v=7"></script>
+    <script type="module" src="/js/main.js?v=8"></script>
   </body>
 </html>

static/js/main.js

@@ -178,7 +178,7 @@ function vehiclePopupContent(vehicle) {
     content += `<br />@ ${vehicle.nearest_station.name}`
   }
 
-  content += `<br /><br /><small>vehicle #: ${vehicle.id}</small>`
+  content += `<br /><br /><small>vehicle #: ${vehicle.id} &middot; trip ID: ${vehicle.trip_id}</small>`
 
   return content
 }