Routing service:

remove routes with lower quality.
Select route if only one route found

src/main/java/de/avatic/lcc/service/calculation/RoutingService.java

@@ -99,8 +99,9 @@ public class RoutingService {
          */
         connectDestinationChainDirectly(container, destinationChains);
 
-        /* remove duplicates. */
+        /* remove duplicates & lower qualities. */
-        removeDuplicateRoutes(container.getRoutes());
+        removeDuplicateRoutes(container.getRoutes(), true);
+
         /*
          * finally find and mark the fastest and the cheapest route.
          */
@@ -122,6 +123,10 @@ public class RoutingService {
             routeInformation.add(routeInformationObj);
         }
 
+        if(routeInformation.size() == 1) {
+            routeInformation.getFirst().getRoute().setSelected(true);
+        }
+
         return routeInformation;
     }
 
@@ -484,16 +489,24 @@ public class RoutingService {
         /*
          * There might be duplicate routes now, because the same route can be created by "nearby-routing" and container rates
          */
-        removeDuplicateRoutes(routes);
+        removeDuplicateRoutes(routes, false);
 
         container.overrideRoutes(routes);
     }
 
-    private void removeDuplicateRoutes(Collection<TemporaryRouteObject> routes) {
+    private void removeDuplicateRoutes(Collection<TemporaryRouteObject> routes, boolean removeLowQuality) {
 
         var toRemove = new ArrayList<TemporaryRouteObject>();
 
+        var bestQuality = routes.stream().map(TemporaryRouteObject::getQuality).reduce((q1, q2) -> q1.ordinal() < q2.ordinal() ? q1 : q2);
+
         for (var route : routes) {
+
+            if(removeLowQuality && route.getQuality().ordinal() > bestQuality.get().ordinal()) {
+                toRemove.add(route);
+                continue;
+            }
+
             var sections = route.getSections();
             boolean hasNearByRouting = sections.getLast().getType().equals(TemporaryRateObject.TemporaryRateObjectType.NEAR_BY);
 
@@ -924,6 +937,10 @@ public class RoutingService {
             this.quality = quality;
         }
 
+        public ChainQuality getQuality() {
+            return quality;
+        }
+
     }