0968-090X/$ see front matter 2013 Elsevier Ltd. All rights reserved. http://dx.doi.org/10.1016/j.trc.2013.06.018 q This paper was presented at the 20th International Symposium on Transportation & Traffic Theory. It therefore also appears in the complete pro of the 20th ISTTT in [Procedia – Social and Behavioral Sciences, vol. 80C (2013), pp. 473–490]. ⇑ Corresponding author. Tel.: +1 518 276 80...

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