Transportation systems, traffic engineering, urban planning and surveying are also important areas of civil engineering. This branch of engineering is, therefore, concerned with the provision of many of the basic services required for the development of modern society. Its successful practice requires the efficient application of mathematics, physics and economics.
Civil engineers are usually employed with organisations, which plan, design and construct the facilities mentioned above, which comprise the essential physical infrastructure for any nation. They also engage in research and development, oriented towards the development of capabilities in all of these fields, and in such special areas as the treatment and the most advantageous use of water resources and engineering materials.