not bad, but your compositions seem a little too static to me and i agree that some of your highlights are blown out
i know cars are kind of difficult to photograph (i'm notoriously bad at it, myself) but i'm sure you'll get the hang of it as time goes on.
in my opinion, the shot of the smokes and the one right after are kind of unnecessary and don't really go with the rest. on the plus side, i think your landscape shots are pretty good, i especially like the one where the road disappears into the fog.
and about what the last guy said about cleaning your lense or whatever, i'm not really sure what he's referring to. the cars may not be absolutely tack sharp, but it seems reasonably in focus to me. maybe he's seeing something i'm not, i dunno.