In Japan, fuel consumption and CO2 emissions in transport sector increased significantly and assuming past increase rates in the future, emission level in transportation sector is expected to rapidly increase. A variety of environmental policies are under debate in Japan, especially tax reduction schemes. As a consequence of ‘green’ tax incentives, changes in the composition of vehicle fleet can be observed and anticipated. For European Automotive Manufacturers in particular, these transportation and environmental conditions are hard to understand and even harder to influence. However, there are different alternatives to cope with these challenges, e.g. reactive or proactive strategies. As a proactive strategy, a concept for modeling, evaluation and forecasting of environmental regulations is developed in this contribution.