The whole idea of fog lights was to shine under the fog. We used to aim them by measuring the height of the light and them aiming them at a spot about 30 feet away on the same horizontal plane. They really didn't work that well but it helped some. We usually had them hooked directly to the battery with a toggle switch in a handy spot. In those days it was not that uncommon for headlights to go out. If that happened, you could flip a toggle switch and have some light.