The U.S. Virgin Islands is the only U.S. jurisdiction that drives on the left. This was inherited from what was then-current practice on the islands at the time of the 1917 transfer of the territory to the United States from Denmark. However, because most cars in the territory are imported from the mainland United States, the cars in the territory are left-hand drive. However, not all U.S. vehicle regulations are in force, and there are vehicles on the road that cannot be sold in the mainland U.S. Additionally, headlights use the U.S. pattern which casts light to the right, tending to blind oncoming drivers. Traffic signals are located on the opposite side of the road than they are in the U.S. mainland, and many standard road signs have been altered to fit the left-side driving.