Headlight

Definition and stakes

Lyle Gifford Boyd,  The World of Flying Saucers: A Scientific Examination of a Major Myth of the Space Age (1963)

“ To the driver of a car on a dark country road, a single light suddenly appearing ahead may241 indicate a plane or a star low in the sky or something on the road itself—a motorcycle, a car with only one headlight working, a workman’s lantern, a pedestrian carrying a flashlight, or something else. A double light may mean another automobile, two motorcycles traveling parallel, an animal whose eyes shine in the approaching headlight, or something else. ”
Source: Gutenberg

Portrait of James Clark McReynolds James Clark McReynolds,  Chicago Great Western Company v…

“ Each locomotive used in road service between sunset and sunrise shall have a headlight which shall afford sufficient illumination to enable a person in the cab of such locomotive who possesses the usual visual capacity required of locomotive enginemen to see in a clear atmosphere, a dark object as large as a man of average size standing erect at a distance of at least 800 feet ahead and in front of such headlight ”
Source: Wikisource

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