Broadway, the theater district of Manhattan, was one of the first electrically lighted areas in the United States. They used arch lamps, which shone a bright startling white. The term, "Great White Way" was coined by Shep Friedman, columnist for the New York Morning Telegraph in 1901. The term caught on (thus becoming a catch phrase) as it implied both safety and sophistication. It glorified the image of the Manhattan theater district in a way that no advertising campaign ever could.
Later, the bright arc lamps were replaced by softer off-white lighting systems. Bright neon light signs filled the streets giving Broadway, and Times Square every color imaginable. Even with all the changes, the name "Great White Way" is clearly embedded in the American consciousness.