Density is one of the key factors of sustainable development in the urban development process. However, the concept of density must be seen in relation to a large, modern public transport system in order to develop sustainability.
High density helps to bring about certain economic values, because the densely populated community is the first condition necessary for commercial development. Today we also see that density is also essential to creating an ecological urban. High density allows to reduce travel distances and increase community connectivity, saving energy. However, these high-density urban centers need to be closely connected. A sustainable eco-city is a city in which high-density areas are connected by a more ecological urban transport system.