Tail Lamp, circa 1907

Taillights were not a standard fixture on early automobiles. Only when cars and roads improved -- and drivers braved the darkness -- did this safety feature become a necessity. Early taillights resembled carriage lamps found on horse-drawn vehicles. This kerosene-fueled tail lamp -- cars usually had only one -- used a red lens to warn approaching vehicles. A clear lens illuminated the license plate or back step.