Claim: Nebraska State Highway System adopted a 15-inch diamond, black-on-white text which later became the official state symbol.
Evidence: The state adopted a 15-inch diamond, black-on-white text with the image of a covered wagon occupying the top half and the route number on the bottom half, a design created by State Engineer Robert L. Cochran. The oxen-and-wagon symbol later became the official state symbol of Nebraska.