The 1991 Master Transportation Concept adopted the goal of reducing CO2 by 20% by the year 2005 (from 1988 levels), formulating measures based on the following principles: - Avoid unnecessary traffic. - Shift traffic to more energy-efficient and environmentally compatible means of transport. - Undertake technical innovations in motor vehicles to optimise energy. - Use real costs. Combined transport was supported under a programme managed by the ERP fund with an annual budget of about ? 2.9 million as of 2006.