URI Routing to the 404 page

[eluser]GregX999[/eluser]
In my routes file I have the following:

Code:

$route['signup'] = "users/signup";
$route['signin'] = "users/signin";
$route['signout'] = "users/signout";

Is there a way to create a route so that if someone types "www.whatever.com/users/signup", they get routed to the 404 page?

I figure I can just make a method in a controller that calls

Code:

show_404($_SERVER['REQUEST_URI'])

and then route to that, but I was wondering if there was a direct way to route right to that page.

Greg