Use your low beams. The visibility in front of you will sharply decrease in a fog, so use the vehicle's low beam lights (if the vehicle does not have fog lights or driving lights). Heavy fog conditions prohibit use of high beam headlights. The light from high beam headlights will be reflected back by thick fog.
Largashbur, an Orc Stronghold. Orc Strongholds are scattered throughout Skyrim, High Rock, and Hammerfell. The Orcs have lived in Skyrim for centuries in tribal communities based around Strongholds. Orcs here live according to the rule of Malacath. Malacath, as Daedric Prince of the Orcs, is worshipped in these places.
Found southeast of Windhelm, its walls also hold the Gloombound Mine. Inside you'll find a tribe led by a sentimental chief with no wives. As with all Orc Strongholds, you must become Blood-Kin to the Orcs before you are welcome in the stronghold and able to barter or receive other services.