Rating the rolling stock is intended to positively discriminate vehicles that are more environmentally friendly and to be an effective instrument in the service of municipal policies, both to restrict traffic during high-pollution episodes as well as to promote new technology through tax incentives or on mobility and the environment. The origin of this rating lay in the National Air Quality Plan, 2013-2016 (Plan Aire) in which it is stated that both particles and nitrogen dioxide mostly originate from wheeled traffic as the main source of emissions in large cities, and it proposes a categorisation of vehicles based on the levels of pollution they emit. The classification of vehicles is consigned in the national registry of vehicles of the Directorate-General of Traffic (DGT), which may be accessed in real time by organisms that are competent in matters of mobility, road safety, taxation or the environment. Through Resolution of April 13, 2016, of the Directorate-General of Traffic, four environmental distinctions were approved, based on the environmental impact of vehicles: Zero emissions, ECO, C and B.
- Resolution of January 8, 2016, of the Directorate-General of Traffic, whereby special measures for traffic regulation during the year 2016 are established.
'- Resolution of April 13, 2016, of the Directorate-General of Traffic, whereby section C.1 of p