I want to create Site Collection such that Site collection should not contain "/sites" in its URL(Except root Site Collection) in SharePoint Foundation 2010. Is it possible to do it?
I think that you could look at the managed paths
You will see that there are at least two path:
Explicit inclusion means that you can create only one site collection with this path. Wildcard inclusion means that you can create so many sites as you wish.
if you would not want to use \sites, you can add you own path. After this you can select this path on site collection creation page.