The main purpose of this paper is to illustrate some of the challenges that arise in addressing efficiency and equity of a package of instruments with a partial equilibrium model of transport model. The paper provides an overview of some equity measures and their properties. The performances of these equity measures are evaluated in the case of a road-pricing scheme for Oslo.
Link
http://econpapers.repec.org/scripts/redir.pl?u=http%3A%2F%2Fwww.ersa.org%2Fersaconfs%2Fersa05%2Fpapers%2F232.pdf;h=repec:wiw:wiwrsa:ersa05p232