1. Post doctoral Researcher, Dept. of Transportation Planning and Engineering, School of Civil Engineering, National Technical Univ. of Athens, 5 Iroon Polytechniou str, Zografou Campus, Athens, Greece 15773 (corresponding author).
2. Associate Professor, Dept. of Transportation Planning and Engineering, School of Civil Engineering, National Technical Univ. of Athens, 5 Iroon Polytechniou str, Zografou Campus, Athens, Greece 15773.
3. Professor, Dept. of Transportation and Hydraulic Works, Faculty of Rural and Surveying Engineering, School of Engineering, Aristotle Univ. of Thessaloniki, Thessaloniki, Greece.