Abstract :
When the first really satisfactory automobile signal was brought out two or three years ago, and a new and thriving business created almostovernight, it did not mean that there had been no need for such signals in the past that highways had suddenly become so cluttered with automobiles that signals found themselves removed from the luxury to the necessity class. Nor was it because motorists suddenly awakened to the fact that signals on their cars added appreciably to their appearance. It meant simply that rear-end collisions were dreaded by the motorist because of the alarming frequency with which they were occurring, particularly under crowded traffic conditions. Motorists were glad to welcome a device which would really minimize this danger, one which did not take their attention unduly from the work at hand just when it should be concentrated most on it, and at the same time was really effective and attracted attention from drivers behind in full sunlight as well as at night.
