Great historical discoveries of the steam engine and the internal combustion engine commenced with the rapid development of road transport accompanied by urbanization and concentration of all the supporting activities in urban areas. The increase in number of personal cars as the most common road vehicles causes increasing environmental pollution and how human kind constantly undermines the relation between a man and the environment, it creates uncertainty for future prosperity. Given the current structure of the urban vehicle fleet, it is important to establish a system in which a man and environment can operate in cohesion without compromising each others value. Such an effort can be achieved by introducing alternative fuels, integrated public II transport of passengers and application of intelligent transport systems. Solution appears in adequate modernization of railways, as well in reducing vehicle weight, educating drivers about eco-driving and organizing and promoting multidimensional transportation. The Republic of Croatia and the city of Rijeka as an example of the unfavorable situation of the urban vehicle fleet with a large number of personal passenger cars, thrives to transform road transport in an environmentally friendly mode of transport and to develop urban transport in the context of sustainable transport.