In road concept, the route network consists of primary and secondary roads, known as main roads and minor roads respectively. Main roads are usually moderate or high capacity roads that are below highway level of service, carrying large volumes of traffic between areas in urban centers and designed for traffic between neighbors. They have intersections with collector and local streets and commercial areas, such as shopping centers, petrol stations and other businesses are located along such roads. In additions, main roads link up to expressways and freeways with inter-changes in cities or rural. Road network constitutes an important element in urban development, due to urban areas have many farms, gardens, forests, so roads and building needed to provide accessibility required by different land uses and the proper functioning of such urban areas depends an efficient transport network existence. In computing des, the network indicator are used to partition road network into different parts in reasonable way. The results in number of connection to describe density differences in road networks. The parameter records how many roads connect to each road in a network. For two roads with the same length, the ones in the dense area will connect to more roads than that in a sparse area and the connection differences will indicate the density differences to some extent, so road density can also be calculated as the total length of all known roads divided by the total land area in a road divided by the total land area in a road network. Hence, governments need to consider road length to decide how to build main or minor roads to design its transportation systems for businesses activities, such as driving lorries and parking lorries and products are been moving on the streets from roads easily and conveniently. As Wikipedia Contributors (2008) indicate that ''transport networks are spatial structures designed to channel flows from the points of demand to points of supply and to link the points together in a transportation system. They are useful for transport network analysis to determine the flow of people, products, services and vehicles.'' Hence, governments need to research whether where the shopping centers, cinemas, houses, hospitals, schools, offices, factories etc. are located, then, which need to follow these location data to predict the cars, lorries, taxies, buses etc. of the demand numbers of transportation users to design the lengths, width and distances and the construction of main and minor roads locations and their supply numbers in different capital cities or country roads. It aims to reduce traffic jams and shorten time and air pollution as well as increasing the available spaces to let the lorry drivers to move their logistic on the road easily and reducing the accidents occurrence when the pedestrians are walking on the streets. If the vehicles can be moved on the roads easily. It will also increase time efficiency and productivity to any businessmen. Hence, how to design of the main roads and/or minor roads in any capital or country cities. It will influence any country's economic growth long time in the future.