There's a list of approved car makes and models for use in NSW[1], and the livery must be approved by the government[2] for it to be used.
NSW[3] has a number of different criteria. Put basically, needs to be either 1) wheelbase of 2800mm (which is almost always luxury cars), 2) a hybrid car seeting 5 to 9 people, or, most commonly, a car that luxury goods tax was sold on.
NSW[3] has a number of different criteria. Put basically, needs to be either 1) wheelbase of 2800mm (which is almost always luxury cars), 2) a hybrid car seeting 5 to 9 people, or, most commonly, a car that luxury goods tax was sold on.
[1]: http://www.transport.nsw.gov.au/taxi-operators
[2]: http://www.transport.nsw.gov.au/sites/default/files/b2b/hire...
[3]: http://www.transport.nsw.gov.au/sites/default/files/b2b/taxi...