Introduction

Abstract

Since historical times world civilization has strived to develop being in a continuous quest for vital resources. Crises and declines of societies have alternated with periods of fruitful development. The world populations have reshaped continuously conquering more territories and developing knowledge and technologies. At any times along the history, humans have strived not only to accommodate with the environment but also to reshape the environment to better suit their needs. This is how human settlements have occurred and further developed over time in towns, cities, countries, and geopolitical regions. Transportation of goods and peoples played a crucial role in all historical times. As the population grows in about an exponential rate as the transportation technology develops. It is projected that by 2050, the world population will reach about 10 billions of inhabitants. Naturally, a modern transportation sector with clean options strives to develop in this context.