diff --git a/core/lib/Drupal/Core/Access/AccessManager.php b/core/lib/Drupal/Core/Access/AccessManager.php
index 7c88963..b28f13c 100644
--- a/core/lib/Drupal/Core/Access/AccessManager.php
+++ b/core/lib/Drupal/Core/Access/AccessManager.php
@@ -127,11 +127,8 @@ public function check(Route $route, Request $request) {
    *  Returns TRUE if the user has access to the route, else FALSE.
    */
   protected function checkAnd(array $checks, Route $route, Request $request) {
-    $access = TRUE;
-    // If there are no checks return FALSE.
-    if (!$checks) {
-      return FALSE;
-    }
+    $access = FALSE;
+
     foreach ($checks as $service_id) {
       if (empty($this->checks[$service_id])) {
         $this->loadCheck($service_id);
@@ -141,6 +138,9 @@ protected function checkAnd(array $checks, Route $route, Request $request) {
       if ($service_access === FALSE) {
         return FALSE;
       }
+      if ($service_access === TRUE) {
+        $access = TRUE;
+      }
     }
 
     return $access;
diff --git a/core/lib/Drupal/Core/Access/DefaultAccessCheck.php b/core/lib/Drupal/Core/Access/DefaultAccessCheck.php
index 074dfd0..224e206 100644
--- a/core/lib/Drupal/Core/Access/DefaultAccessCheck.php
+++ b/core/lib/Drupal/Core/Access/DefaultAccessCheck.php
@@ -26,6 +26,14 @@ public function applies(Route $route) {
    * Implements AccessCheckInterface::access().
    */
   public function access(Route $route, Request $request) {
-    return $route->getRequirement('_access') === 'TRUE';
+    if ($route->getRequirement('_access') === 'TRUE') {
+      return TRUE;
+    }
+    elseif ($route->getRequirement('_access') === 'FALSE') {
+      return FALSE;
+    }
+    else {
+      return NULL;
+    }
   }
 }
diff --git a/core/modules/system/tests/modules/router_test/lib/Drupal/router_test/Access/DefinedTestAccessCheck.php b/core/modules/system/tests/modules/router_test/lib/Drupal/router_test/Access/DefinedTestAccessCheck.php
index 744c836..77248dc 100644
--- a/core/modules/system/tests/modules/router_test/lib/Drupal/router_test/Access/DefinedTestAccessCheck.php
+++ b/core/modules/system/tests/modules/router_test/lib/Drupal/router_test/Access/DefinedTestAccessCheck.php
@@ -27,7 +27,7 @@ public function applies(Route $route) {
    * {@inheritdoc}
    */
   public function access(Route $route, Request $request) {
-    return $route->getRequirement('_test_access') === 'TRUE';
+    return $route->getRequirement('_test_access') === 'TRUE' ?: NULL;
   }
 
 }
diff --git a/core/tests/Drupal/Tests/Core/Access/AccessManagerTest.php b/core/tests/Drupal/Tests/Core/Access/AccessManagerTest.php
index 4cdcac2..1c90d33 100644
--- a/core/tests/Drupal/Tests/Core/Access/AccessManagerTest.php
+++ b/core/tests/Drupal/Tests/Core/Access/AccessManagerTest.php
@@ -44,6 +44,14 @@ class AccessManagerTest extends UnitTestCase {
    */
   protected $accessManager;
 
+  public static function getInfo() {
+    return array(
+      'name' => 'Access manager tests',
+      'description' => 'Test for the AccessManager object.',
+      'group' => 'Routing',
+    );
+  }
+
   /**
    * {@inheritdoc}
    */
@@ -145,6 +153,21 @@ public function testCheckConjunctions() {
       '_test_access' => 'TRUE',
       '_access_conjunction' => 'AND',
     )));
+    $this->routeCollection->add('test_route_9', new Route('/test-route-9', array(), array(
+      '_access' => 'NULL',
+      '_test_access' => 'TRUE',
+      '_access_conjunction' => 'AND',
+    )));
+    $this->routeCollection->add('test_route_10', new Route('/test-route-10', array(), array(
+      '_access' => 'NULL',
+      '_test_access' => 'TRUE',
+      '_access_conjunction' => 'OR',
+    )));
+    $this->routeCollection->add('test_route_11', new Route('/test-route-11', array(), array(
+      '_access' => 'NULL',
+      '_test_access' => 'FALSE',
+      '_access_conjunction' => 'OR',
+    )));
 
     $this->accessManager->setChecks($this->routeCollection);
 
@@ -152,8 +175,11 @@ public function testCheckConjunctions() {
     $expected['test_route_4'] = TRUE;
     $expected['test_route_5'] = TRUE;
     $expected['test_route_6'] = TRUE;
-    $expected['test_route_7'] = TRUE;
+    $expected['test_route_7'] = FALSE;
     $expected['test_route_8'] = FALSE;
+    $expected['test_route_9'] = TRUE;
+    $expected['test_route_10'] = TRUE;
+    $expected['test_route_11'] = FALSE;
 
     foreach ($expected as $route_name => $expected_access) {
       $this->assertSame($this->accessManager->check($this->routeCollection->get($route_name), $request), $expected_access);
diff --git a/core/tests/Drupal/Tests/Core/Access/DefaultAccessCheckTest.php b/core/tests/Drupal/Tests/Core/Access/DefaultAccessCheckTest.php
index d96825c..bb96686 100644
--- a/core/tests/Drupal/Tests/Core/Access/DefaultAccessCheckTest.php
+++ b/core/tests/Drupal/Tests/Core/Access/DefaultAccessCheckTest.php
@@ -62,13 +62,15 @@ public function testApplies() {
    * Test the access method.
    */
   public function testAccess() {
-    $route = new Route('/test-route');
     $request = new Request(array());
 
-    $route->addRequirements(array('_access' => 'FALSE'));
+    $route = new Route('/test-route', array(), array('_access' => 'NULL'));
+    $this->assertNull($this->accessChecker->access($route, $request));
+
+    $route = new Route('/test-route', array(), array('_access' => 'FALSE'));
     $this->assertFalse($this->accessChecker->access($route, $request));
 
-    $route->addRequirements(array('_access' => 'TRUE'));
+    $route = new Route('/test-route', array(), array('_access' => 'TRUE'));
     $this->assertTrue($this->accessChecker->access($route, $request));
   }