 For CEP 10 fleet, the first digit was a 0 (0xxx), the DGRL was three digit, preceded by the letter L (Lisboa) or CS (Cascais and Sintra) (L-xxx, CS-xxx), with the numbering strictly distributed by chassis manufacturer.In order to privatize the operator in 1991 RN became RNIP ("Rodoviária Nacional Investimentos e Participações"