 Only rear plates have been required since 1942.In 1956, the United States, Canada, and Mexico came to an agreement with the American Association of Motor Vehicle Administrators, the Automobile Manufacturers Association and the National Safety Council that standardized the size for license plates for vehicles (except those for motorcycles) at in height by in width, with standardized mounting holes.The 1956 (dated 1957) issue was the first Georgia license plate that fully complied with these standards