The province of Skyrim is big. Really, really big. So big that horses might not be fast enough to cover the amount of ground that you need to cover.
Fortunately, Skyrim Nexus mod-maker zdzichorowerzysta (nice handle, buddy!) has made the helpfully titled "Car Mod", which replaces horses in the game with cars.
There's a real Army of Darkness mod to watching the Dovahkiin tear across the plains and cities of Skyrim in a banged-up convertable.
This video by Hi5M0F0 catches the mod in all its bizarre glory. More mods like this, please! While those 360 folks are having fun with Dawnguard, I'll be driving around in a CAR, so WHATEVER.
Car Mod [Skyrim Nexus]