diff --git a/src/MvcSiteMapProvider/MvcSiteMapProvider/ISiteMap.cs b/src/MvcSiteMapProvider/MvcSiteMapProvider/ISiteMap.cs
index ff23e1d8..4d8821be 100644
--- a/src/MvcSiteMapProvider/MvcSiteMapProvider/ISiteMap.cs
+++ b/src/MvcSiteMapProvider/MvcSiteMapProvider/ISiteMap.cs
@@ -51,4 +51,12 @@ public interface ISiteMap
         [Obsolete("ResolveActionMethodParameters is deprecated and will be removed in version 5.")]
         IEnumerable<string> ResolveActionMethodParameters(string areaName, string controllerName, string actionMethodName);
     }
+
+    public static class SiteMapExtensions
+    {
+        public static string GetUrlContextKey(this ISiteMap siteMap)
+        {
+            return "__MVCSITEMAP_" + siteMap.CacheKey + "_UrlContext_" + siteMap.IsReadOnly.ToString() + "_";
+        }
+    }
 }
diff --git a/src/MvcSiteMapProvider/MvcSiteMapProvider/RequestCacheableSiteMap.cs b/src/MvcSiteMapProvider/MvcSiteMapProvider/RequestCacheableSiteMap.cs
index 2c719d6d..4dfc36ab 100644
--- a/src/MvcSiteMapProvider/MvcSiteMapProvider/RequestCacheableSiteMap.cs
+++ b/src/MvcSiteMapProvider/MvcSiteMapProvider/RequestCacheableSiteMap.cs
@@ -86,8 +86,17 @@ public override bool IsAccessibleToUser(ISiteMapNode node)
             var result = this.requestCache.GetValue<bool?>(key);
             if (result == null)
             {
+                // Fix for #272 - Change the context of the URL cache to ensure
+                // that the AclModule doesn't prevent manually setting route values
+                // from having any effect on the URL. This setting takes effect in
+                // the RequestCacheableSiteMapNode.Url property.
+                var urlContextKey = this.GetUrlContextKey();
+                this.requestCache.SetValue<string>(urlContextKey, "AclModule");
                 result = base.IsAccessibleToUser(node);
                 this.requestCache.SetValue<bool>(key, (bool)result);
+
+                // Restore the URL context.
+                this.requestCache.SetValue<string>(urlContextKey, string.Empty);
             }
             return (bool)result;
         }
diff --git a/src/MvcSiteMapProvider/MvcSiteMapProvider/RequestCacheableSiteMapNode.cs b/src/MvcSiteMapProvider/MvcSiteMapProvider/RequestCacheableSiteMapNode.cs
index 8a60a975..550cdd5f 100644
--- a/src/MvcSiteMapProvider/MvcSiteMapProvider/RequestCacheableSiteMapNode.cs
+++ b/src/MvcSiteMapProvider/MvcSiteMapProvider/RequestCacheableSiteMapNode.cs
@@ -124,7 +124,16 @@ public override bool IsVisible(IDictionary<string, object> sourceMetadata)
 
         public override string Url
         {
-            get { return this.GetCachedOrMemberValue<string>(() => base.Url, "Url", true); }
+            get 
+            {
+                // Fix for #272 - Change the context of the URL cache to ensure
+                // that the AclModule doesn't prevent manually setting route values
+                // from having any effect on the URL.
+                var urlContext = this.requestCache.GetValue<string>(this.SiteMap.GetUrlContextKey());
+                var memberName = "Url" + (string.IsNullOrEmpty(urlContext) ? string.Empty : "_" + urlContext);
+
+                return this.GetCachedOrMemberValue<string>(() => base.Url, memberName, true); 
+            }
             set { base.Url = value; }
         }