In recent decades one can observe a huge increase in traffic volume on Slovenian highways, and consequently on the Ljubljana ring, where 4 main highways intersect. High traffic volumes result in traffic congestion and delays on highways, on the Ljubljana ring, and on the main roads towards and in Ljubljana. On the east side of Ljubljana is located BTC – a shopping mall, sports, entertainment and business area, with more than 500 shops. Although being one of the largest shopping and entertainment complexes in Europe, the future development of this area is foreseen. New business and shopping facilities will have a significant impact on the traffic situation. Additional traffic will decrease the level of service on the nearby roads and on the already often congested Ljubljana ring, and therefore measures for the road infrastructure will be needed. To set the optimal solution several possible infrastructure measures should be tested and evaluated, usually with the macroscopic and microscopic simulations. For the problem presented in this paper the macroscopic model was used for the traffic forecast, while the microscopic model was used for the optimization of proposed solutions.

road capacity, motroways, microscopic mode, macroscopic model