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 6 inches (15 cm) in height by 12 inches (30 cm) in width, with standardized mounting holes.
The first Virginia license plate that complied with these standards was issued eight years beforehand, in 1948.

No slogans were used on passenger plates during the period covered by this subsection.
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 6 inches (15 cm) in height by 12 inches (30 cm) in width, with standardized mounting holes. The first Virginia license plate that complied with these standards was issued eight years beforehand, in 1948.
No slogans were used on passenger plates during the period covered by this subsection.
Vehicle registration plates of Virginia