1. Faculty of Civil and Water Resources Engineering, Bahir Dar Institute of Technology, Bahir Dar University, P.O. Box. 26, Bahir Dar, Ethiopia
2. KTH Royal Institute of Technology, Division of Transport Planning, Brinellvägen 23, Stockholm, Sweden
3. BME-Budapest University of Technology and Economics, Department of Transport Technology and Economics, H-1111, Muegyetem rkp 3, Budapest, Hungary
4. KTI-Institute for Transport Science, Directorate for Strategy, Research and Development and Innovation, Than Karoly str 3–5, Budapest, Hungary