Direct subsidies for important projects such as building BRT systems can also help. It can voluntarily improve its vehicle fleet fuel economy, more aggressively market its more efficient vehicles and provide better information to consumers. Renault, for example, has lobbied for a harmonisation in European vehicle C02 tax policies, which currently vary considerably among the 27 EU countries. Ultimately though, voluntary fuel economy improvement programmes have been found to be inadequate, national standards and tax policies appear necessary to successfully lower the fuel intensity of passenger cars.