Every road or transport scheme, besides what it does for traffic, has a cost, an effect on the environment and on people, and an energy bill. Rahyaft measures these before the decision is made: environmental, economic and social impact assessment of transport and road schemes, studies to reduce energy use in transport, and technical and economic feasibility studies that set what a scheme returns against what it costs.
The work serves bodies that must decide whether a scheme goes ahead or which option to build, from national agencies and road authorities to municipalities. The result is a clear comparison of each option's costs, impacts and energy use, so that the choice rests on figures. In energy work, Rahyaft has ranked fuel-saving strategies using an odds-ratio method.