Allowing the worker to choose their car. Quoting GGP:

> (A) that the worker is free from the control and direction of the hirer in connection with the performance of the work, both under the contract for the performance of such work and in fact;

There's only so many computers. Graphic designers deliver an end product regardless of this. The end result is all that matters. The business of Uber is conveying people from point a to point b safely. Their contractors should have the ability to use whatever vehicle safely conveys people from a to b. If they don't have a choice then they are employees not contractors.

You could discriminate based on the Blue Book value or some other agreed upon value for a car, combined with commonly agreed upon ratings for a car.

For example, under the current UberBlack rules for NYC, you couldn't drive a BMW 6 series, any Porsche, a Toyota Sequoia, a Nissan Armada, any Dodge, and this is just comparing cars listed on Blue Book with similar ratings and starting prices: https://www.kbb.com/car-finder/5/?pricerange=65000-max&inten...

If you need a whitelist because some of these cars under arbitrary rules won't meet your criteria even though they're comparable, that's less "contracting for the job" and more "specifying the terms of how you work."

When you ask for a plumber, you ask that they show up with tools, you don't tell them only Black&Decker, Craftsman, etc. are acceptable and any deviation from the list won't do. (I know nothing about tool brands and quality, this is just a hypothetical example.)