The book aims to present the basics regarding the development of transportation networks and especially of road networks and also to present the required tasks towards the planning and construction of the road network infrastructure. The book also provides a general presentation of parameters involving planning and design of the road network (alignment study, preliminary study, final study) and the individual techniques for project construction (earthworks, road surfacing, bridges etc.). It also includes the presentation of the main phases for the design of transportation systems and the most important elements that constitute the rail and air network.