-Chapter 2 What are construction of roads design networks benefits? In fact, construction of roads increased substantially with the opening up of residential environments that also is getting much benefits from increasing demand for spaces in commercial properties. Many private companies, retail stores, commercial banks aggregate in the main roads of cities, which get advantage of opportunities afforded by locations near central of cities to attract many pedestrians concerning their businesses existence. This led to high concentration of vehicular and pedestrian movements. Specially along the access main roads in the central of cities. The main roads exhibits linkages to form networks of minor routes along which commercial properties locate. If commercial users are displaced residential users, causing sites to be at the highest and best uses with increases in the values of commercial properties. However, it seems road network development is affected by the compact nature of various routes that sometimes causes volume of traffic jam. Thus, demand for transport can't be treated solely as a derived demand road. Improved main and minor roads access an city or rural areas is a necessary ( but not sufficient). Precondition for increased productivity, the UK Standing Advisory committee On Trunk Road Assessment (SACTRA, 1999) noted "various ways in which transport can affect economic growth, for example benefits include through reorganization and rationalization of production, distribution and land use: reducing labor costs by expanding catchment areas etc."What is land use and road transport design system relationship? Land use refers to the whole range of human activity and of the built environment, and to some aspects of the natural environment. This is a way relationship between land use and road transport. Governments need to design how to use land and how to design road transportation systems. e.g. where are built the main roads and/or where are built the minor roads are the most suitable locations in the cities or rural areas ? If the main roads is located in the not suitable locations at the centers of the cities or rural, it will case the increasing traffic volumes and levels of congestion, including air pollution, noise, ground water pollution from run-off, loss of soil functions and loss of bio-diversity to natural environment. By influencing the spatial structure of locations in the urban environment, so land use planning can help to mitigate any negative effects resulting from land use changes.