ACCESSIBILITY MESURES AND EQUITY: A PHILOSOPHICAL EXPLORATION Karel Martens Radboud University Nijmegen, Institute for Management Research, PO Box 9108, 6500HK, Nijmegen, the Netherlands, Tel +31-24-361-2740, Fax +31-24-361-1841, E-mail: k.martens@fm.ru.nl, Internet: http://radboud.academia.edu/KMartens Aaron Golub School of Geographical Sciences and Urban Planning and School of Sustainability, Arizona State University, United States, aaron.golub@asu.edu Paper to be presented at the 91th Annual Conference of the Transportation Research Board 22-26 January 2012, Washington DC, USA