Why is the license plate of Longjiang escort vehicle not white?

The armored car is not a special vehicle, but unfortunately it was named as 120. , belonging to general commercial vehicles.

Escorts escorting banknotes to banks are not policemen or armed police, but guards recruited from the society by security companies managed by public security organs, that is, a kind of security. Similarly, although their armored vehicles are special vehicles, they are not police cars of political and legal departments. If it is not a police car, you can't use the word "police", which shows that your management in this area is relatively standardized.