diff --git a/modules/@angular/router/src/common_router_providers.ts b/modules/@angular/router/src/common_router_providers.ts
index e41ec965cb..e6171ce902 100644
--- a/modules/@angular/router/src/common_router_providers.ts
+++ b/modules/@angular/router/src/common_router_providers.ts
@@ -9,12 +9,13 @@
 import {Location, LocationStrategy, PathLocationStrategy} from '@angular/common';
 import {ANALYZE_FOR_ENTRY_COMPONENTS, APP_BOOTSTRAP_LISTENER, APP_INITIALIZER, ApplicationRef, ComponentResolver, Injector, NgModuleFactoryLoader, OpaqueToken, SystemJsNgModuleLoader} from '@angular/core';
 
-import {Routes} from './config';
+import {Route, Routes} from './config';
 import {Router} from './router';
 import {ROUTER_CONFIG, ROUTES} from './router_config_loader';
 import {RouterOutletMap} from './router_outlet_map';
 import {ActivatedRoute} from './router_state';
 import {DefaultUrlSerializer, UrlSerializer} from './url_tree';
+import {flatten} from './utils/collection';
 
 export const ROUTER_CONFIGURATION = new OpaqueToken('ROUTER_CONFIGURATION');
 
@@ -29,13 +30,14 @@ export interface ExtraOptions {
 export function setupRouter(
     ref: ApplicationRef, resolver: ComponentResolver, urlSerializer: UrlSerializer,
     outletMap: RouterOutletMap, location: Location, injector: Injector,
-    loader: NgModuleFactoryLoader, config: Routes, opts: ExtraOptions = {}) {
+    loader: NgModuleFactoryLoader, config: Route[][], opts: ExtraOptions = {}) {
   if (ref.componentTypes.length == 0) {
     throw new Error('Bootstrap at least one component before injecting Router.');
   }
   const componentType = ref.componentTypes[0];
   const r = new Router(
-      componentType, resolver, urlSerializer, outletMap, location, injector, loader, config);
+      componentType, resolver, urlSerializer, outletMap, location, injector, loader,
+      flatten(config));
 
   if (opts.enableTracing) {
     r.events.subscribe(e => {
@@ -130,7 +132,7 @@ export function provideRouterInitializer() {
 export function provideRoutes(routes: Routes): any {
   return [
     {provide: ANALYZE_FOR_ENTRY_COMPONENTS, multi: true, useValue: routes},
-    {provide: ROUTES, useValue: routes}
+    {provide: ROUTES, multi: true, useValue: routes}
   ];
 }
 
diff --git a/modules/@angular/router/src/router_config_loader.ts b/modules/@angular/router/src/router_config_loader.ts
index 5f73d112a3..a3ef2f475a 100644
--- a/modules/@angular/router/src/router_config_loader.ts
+++ b/modules/@angular/router/src/router_config_loader.ts
@@ -11,7 +11,7 @@ import {Observable} from 'rxjs/Observable';
 import {fromPromise} from 'rxjs/observable/fromPromise';
 
 import {Route} from './config';
-
+import {flatten} from './utils/collection';
 
 
 /**
@@ -33,7 +33,7 @@ export class RouterConfigLoader {
     return fromPromise(this.loader.load(path).then(r => {
       const ref = r.create(parentInjector);
       return new LoadedRouterConfig(
-          ref.injector.get(ROUTES), ref.injector, ref.componentFactoryResolver);
+          flatten(ref.injector.get(ROUTES)), ref.injector, ref.componentFactoryResolver);
     }));
   }
 }
diff --git a/modules/@angular/router/test/router.spec.ts b/modules/@angular/router/test/router.spec.ts
index 2f5b1c774e..2fb29c3e98 100644
--- a/modules/@angular/router/test/router.spec.ts
+++ b/modules/@angular/router/test/router.spec.ts
@@ -1445,6 +1445,57 @@ describe('Integration', () => {
                           .toHaveText('lazy-loaded-parent [lazy-loaded-child]');
                     })));
 
+    it('should combine routes from multiple modules into a single configuration',
+       fakeAsync(inject(
+           [Router, TestComponentBuilder, Location, NgModuleFactoryLoader],
+           (router: Router, tcb: TestComponentBuilder, location: Location,
+            loader: SpyNgModuleFactoryLoader) => {
+             @Component({selector: 'lazy', template: 'lazy-loaded-2'})
+             class LazyComponent2 {
+             }
+
+             @NgModule({
+               declarations: [LazyComponent2],
+               imports: [RouterModule.forChild([{path: 'loaded', component: LazyComponent2}])],
+               entryComponents: [LazyComponent2]
+             })
+             class SiblingOfLoadedModule {
+             }
+
+             @Component(
+                 {selector: 'lazy', template: 'lazy-loaded-1', directives: ROUTER_DIRECTIVES})
+             class LazyComponent1 {
+             }
+
+             @NgModule({
+               declarations: [LazyComponent1],
+               imports: [
+                 RouterModule.forChild([{path: 'loaded', component: LazyComponent1}]),
+                 SiblingOfLoadedModule
+               ],
+               entryComponents: [LazyComponent1]
+             })
+             class LoadedModule {
+             }
+
+             loader.stubbedModules = {expected1: LoadedModule, expected2: SiblingOfLoadedModule};
+
+             const fixture = createRoot(tcb, router, RootCmp);
+
+             router.resetConfig([
+               {path: 'lazy1', loadChildren: 'expected1'},
+               {path: 'lazy2', loadChildren: 'expected2'}
+             ]);
+
+             router.navigateByUrl('/lazy1/loaded');
+             advance(fixture);
+             expect(location.path()).toEqual('/lazy1/loaded');
+
+             router.navigateByUrl('/lazy2/loaded');
+             advance(fixture);
+             expect(location.path()).toEqual('/lazy2/loaded');
+           })));
+
     it('should use the injector of the lazily-loaded configuration',
        fakeAsync(inject(
            [Router, TestComponentBuilder, Location, NgModuleFactoryLoader],
diff --git a/modules/@angular/router/testing/router_testing_module.ts b/modules/@angular/router/testing/router_testing_module.ts
index d06561cb59..e3c0346108 100644
--- a/modules/@angular/router/testing/router_testing_module.ts
+++ b/modules/@angular/router/testing/router_testing_module.ts
@@ -10,9 +10,10 @@ import {Location, LocationStrategy} from '@angular/common';
 import {MockLocationStrategy, SpyLocation} from '@angular/common/testing';
 import {Compiler, ComponentResolver, Injectable, Injector, NgModule, NgModuleFactory, NgModuleFactoryLoader} from '@angular/core';
 
-import {Router, RouterOutletMap, Routes, UrlSerializer} from '../index';
+import {Route, Router, RouterOutletMap, UrlSerializer} from '../index';
 import {ROUTES} from '../src/router_config_loader';
 import {ROUTER_PROVIDERS, RouterModule} from '../src/router_module';
+import {flatten} from '../src/utils/collection';
 
 
 
@@ -39,8 +40,9 @@ export class SpyNgModuleFactoryLoader implements NgModuleFactoryLoader {
 
 function setupTestingRouter(
     resolver: ComponentResolver, urlSerializer: UrlSerializer, outletMap: RouterOutletMap,
-    location: Location, loader: NgModuleFactoryLoader, injector: Injector, routes: Routes) {
-  return new Router(null, resolver, urlSerializer, outletMap, location, injector, loader, routes);
+    location: Location, loader: NgModuleFactoryLoader, injector: Injector, routes: Route[][]) {
+  return new Router(
+      null, resolver, urlSerializer, outletMap, location, injector, loader, flatten(routes));
 }
 
 /**