People aren't going to go out of their way to drive more purely for the sake of driving more, but if driving is cheap, it may compare favorably to an alternative. For example, someone who lives at 11 and Woodward and works downtown can either drive to work and save some time, or take the SMART bus and save some money. If the cost of driving is reduced, that shifts the equation in favor of driving, and might cause some people at the margins to choose to drive when they otherwise might have taken the bus. Some people might decide that it's now feasible for them to move further from work to a house or neighborhood they like better, when otherwise they might have been hesitant to do so given the increased cost of commuting the longer distance, and others might decide to drive themselves when they otherwise would have carpooled.
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