does URI use XSS Clean automatically?

[eluser]xpix[/eluser]
I know that only certain characters are allowed:

URI Security

CodeIgniter is fairly restrictive regarding which characters it allows in your URI strings in order to help minimize the possibility that malicious data can be passed to your application. URIs may only contain the following:

* Alpha-numeric text
* Tilde: ~
* Period: .
* Colon: :
* Underscore: _
* Dash: -