Codes used in several countries
RT on a licence plate
RT is an area code in 4 countries. The plate's style and country code tell them apart.
Germany
RT-AB 1234Code details →Reutlingen (Baden-Württemberg)
Norway
RT 12345Code details →Rogaland
named after Stavanger
Poland
RT 12345Code details →Tarnobrzeg (Subcarpathian)
United Kingdom
RT51 ABCCode details →Reading