A problem with routing (multiple wildcards?)

[eluser]#1313[/eluser]
Hello everybody, another newbie coming up!

My site has a cars catalogue, and i want to produce following URIs for my cars:

Code:

http://site.com/cars/lamborgini

and for specific models:

Code:

http://site.com/cars/lamborgini/murcielago

I have following functions in my Cars controller, car_maker() and car_model(), and a simple rule in routes.php:

Code:

$route['cars/:any'] = "cars/car_maker";

which succesfully sends control to car_maker function. Great, i can read about Lamborginis.

But now i want to read a page about Lamborgini Murcielado. I want to add a routing rule to launch car_model function, but i don't know how to write a rule with multiple wildcard characters properly. I tried

Code:

$route['cars/:any/:any'] = "cars/car_maker/car_model";

but this isn't working. How do i do this?