Madrid is the capital of Spain. It's featured in the original Euro Truck Simulator, but excluded in Euro Truck Simulator 2 official map. Some player mods have the ETS2 map expanded to include Spain (and thus Madrid).
Madrid is the base city for truckers starting in Spain or Portugal, with a truck dealer present in the city. However, the cargo choice from the city is limited, with only the EuroAcres farm and TREE-ET mill (both to the east of the city) available for new jobs, while the Kaarfor depot in the city only accepts goods from other cities.