The research unit develops scientific foundations for the derivation of reference values which allow a reliable assessment of the quality of traffic flow on streets without direction separation, especially in hilly terrain and in longer tunnels, taking into account Swiss conditions (traffic behavior, types of operation, speed limits, development standards, slope conditions). The examination should be carried out according to the procedure for traffic engineering design in the existing standards.

With regard to methods for determining the performance of the transport quality and capacity of transportation facilities, many questions remain unanswered when it comes to major and interconnecting roads. The appropriate standard SN 640 020 because even often still formulated very openly, knowing that the basics are sparse.

Due to existing and collected data and with the help of simulations benchmarks for performance and quality levels of traffic direction not separate roads should be developed. The influencing factors are to define and quantify. For traffic quality the decisive criterion is to be determined.