The following recommendations are from the Canadian Medical Association. People with vestibular disorders that affect one ear (unilateral), such as labyrinthitis or vestibular neuritis, should not drive until their condition has subsided and the acute symptoms are resolved. People with Ménière's disease or other recurrent vestibular disorders should pull off the road at the first sign of an acute attack and wait until symptoms ease off. Those prone to severe, prolonged attacks should avoid driving long distances alone. Those with acute episodes without warning symptoms – particularly sudden drop attacks – should not drive until symptoms have been controlled or have eased off for at least six months. People with benign paroxysmal positional vertigo (BPPV) are usually safe to drive unless they are sensitive to horizontal head movements, in which case they should not drive until their condition has eased off or responded to treatment. Those with little or no balance function in both ears (bilateral vestibulopathy) may not be safe to drive.