1 Department of Transport and Planning, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, P.O. Box 5048, 2600 GA Delft, Netherlands. Electronic address: h.farah@tudelft.nl.
2 Department of Transport and Planning, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, P.O. Box 5048, 2600 GA Delft, Netherlands.
3 School of Transportation Sciences, UHasselt-Hasselt University, Agoralaan, 3590 Diepenbeek, Belgium.