Check movement with vehicle enter.

src/main/java/com/sk89q/worldguard/bukkit/listener/PlayerMoveListener.java

@@ -32,6 +32,7 @@
 import org.bukkit.event.Listener;
 import org.bukkit.event.player.PlayerMoveEvent;
 import org.bukkit.event.player.PlayerRespawnEvent;
+import org.bukkit.event.vehicle.VehicleEnterEvent;
 import org.bukkit.plugin.PluginManager;
 import org.bukkit.util.Vector;
 
@@ -58,6 +59,18 @@ public void onPlayerRespawn(PlayerRespawnEvent event) {
         session.testMoveTo(player, event.getRespawnLocation(), MoveType.RESPAWN, true);
     }
 
+    @EventHandler
+    public void onVehicleEnter(VehicleEnterEvent event) {
+        Entity entity = event.getEntered();
+        if (entity instanceof Player) {
+            Player player = (Player) entity;
+            Session session = plugin.getSessionManager().get(player);
+            if (null != session.testMoveTo(player, event.getVehicle().getLocation(), MoveType.EMBARK, true)) {
+                event.setCancelled(true);
+            }
+        }
+    }
+
     @EventHandler(priority = EventPriority.HIGH)
     public void onPlayerMove(PlayerMoveEvent event) {
         final Player player = event.getPlayer();

src/main/java/com/sk89q/worldguard/session/MoveType.java

@@ -29,6 +29,7 @@
 public enum MoveType {
 
     RESPAWN(false),
+    EMBARK(true),
     MOVE(true),
     TELEPORT(true),
     RIDE(true),