Get Original URL after being rewrite by URI Routing

[eluser]chandrajatnika[/eluser]
Is that possible for get an original URL after being rewrite by uri routing?
this is my uri routing code (on application/config/routes.php) :

Code:

$route['(sell|buy)/(:num)/(:any).html'] = 'adlist/index/?adType=$1&adCategory;=$2';

I use URI routing only for SEO purpose, and I don't want to change a lot of program logic by doing this.
If I receive an original URL, nothing will happen but when I call uri_string() function, I receive 'fake' URL 'sell/1/Car.html'.
Can I get an original URL like 'adlist/index/?adType=sell&adCategory=1' ??

Thanks for your answers, It will help me a lot.