is it possible to drive at night? Err ... I mean _inside_ of Vdrift of course ;-)
I have seen an image showing a night scenario but I do not find any option inside Vdrift.
Unfortunately there's no way to do it at the moment. When we moved to fully 3d modeled tracks the old sky code wasn't used, in favor of having the artists do skyboxes. There's an open issue about it: