Transport in general, especially road transport is big CO2 and other exhaust gas emission producer. Transport is also one of the biggest energy consumer. The main aim of this paper is accentuation of the eco test as one of the most important actions which is used to preserve the environment because by controlling the exhaust of every vehicle it is determined whether or not that vehicle pollutes the environment more than it is necessary. For the purpose of testing for exhaust gases the motors have ben devided into three basic groups: NO-CAT, REG-CAT and DIESEL. For every type of engine the test is carried out in a different way, and every type of engine has its limit values that he has to satisfy during the eco test. It is also important to enhance the eco ride as a measure of education of drivers in realization of long lasting goals of continuous development in mobility with simultaneously exhaust gas and noise reduction, driving safety and energy efficiency increasing in transport sector.