diff --git a/libdata.php b/libdata.php
index 05302b1..3f53aac 100644
--- a/libdata.php
+++ b/libdata.php
@@ -34,4 +34,45 @@ function getRoutesByStop($stopId){
     return $tmp;
 }
 
+function isValidRoute($id){
+    global $routes;
+    foreach ($routes as $route){
+        if ($route['id'] == $id){
+            return true;
+        }
+    }
+    return false;
+}
+
+function isValidLine($line){
+    global $routes;
+    foreach ($routes as $route){
+        if ($route['line'] == $line){
+            return true;
+        }
+    }
+    return false;
+}
+
+function getRouteInfo($id){
+    global $routes;
+    foreach ($routes as $route){
+        if ($route['id'] == $id){
+            return $route;
+        }
+    }
+    return false;
+}
+
+function getStopInfo($id){
+    global $stops;
+    foreach ($stops as $stop){
+        if ($stop['id'] == $id){
+            return $stop;
+        }
+    }
+    return false;
+}
+
+
 ?>