I once drove about 76 miles in soupy fog. Visibility was about 20 feet. I kept the headlights off as long as I could. Then I used electrical tape to make a cross cross on the headlights to only allow enough light through to see the magic white line.
I remember the line disappearing for a short bit and being quite scared of finding a tree.
A hearty huzzah to Mr. Dorr.
And your headlight high beams were activated by your left foot on a button on the floor board.
A clever idea!