the letter B (B stands for badawcza, which translates to "testing type"). Only car manufacturers and automobile R&D centres are issued these plates. Custom plates Format: X1 JKLMN These plates use standard black letters on a white background. Each custom number starts with the letter denoting voivodeship and a single digit, followed by the gap. This digit and next characters can be picked by the owner. Outside the availability the following constrains are used: after the gap between 3 and 5 characters can be used the first character must be a letter no more than 2 last characters can be digits all letters come before digits (i.e. they cannot be intermixed) any standard Latin letter outside Q can be used (unlike common licence plates) resulting plate must not contain or resemble offensive contents Professional plates Format: X12 34P56 (second letter is always "P") Since July 2019 car dealers of new cars can apply for special number plates with green letters on white background specifically for doing test drives. Those plates are issued exclusively for the company itself and not for a specific car which means that those plates can be applied to multiple vehicles at once. Only car retailers can obtain one and such cars can be driven only by the car dealer, owner of the company, his employees or by the customers but only while being accompanied by car dealership owner or his worker. Diplomatic plates Format: X 123456 White symbols on blue background. First three digits indicate country or organization. Table of codes: Service plates Format: H#J K234 H#J 12KL Vehicles utilised used by the Polish Ministry of Internal Affairs and Administration use licence plates beginning with "H", instead of the voivodeship code. The second letter denotes the service, for example "HP" is used by the Polish Police. Any standard Latin letter outside Q can be used (unlike common licence plates). These services are also allowed to use common licence plates. Codes: HA# – Central Bureau of Anticorruption HB# – Government Protection Bureau HC# – Customs Service HK# – Internal Security Agency, Foreign Intelligence Agency HM# – Military Counterintelligence Agency, Military Intelligence Agency HP# – Police HS# – Fiscal Control HW# – Border Guard Military plates Format: U# 12345 UC 1234T UK 1234 The Polish military uses licence plates beginning with "U" instead of the voivodeship code. The following letter denotes the usage of the vehicle. For example,