All such names are posted in white letters on blue background, like:  A-49  or  AP-4 . Note that none of these naming and coloring requisites affect roads under the authority of the Autonomous Communities. For example, the A-8 road in the Basque Country is a tolled "autopista", as are the C-16, C-32 and C-33 in Catalonia. Other communities such as Madrid do follow the convention, and have names as MP-203 for a tolled road and M-501 for a free "autovía". Furthermore, roads under the authority of the Andalusian government also start with A, but they have longer numeric codes and different coloring.