A few may also mention the value of their travel time and accident risk. These however are only a portion of total costs. The full cost of driving includes these internal costs plus several external costs. Of course there is considerable variation in the cost of any specific trip, but these estimates, and variations for different travel modes and specific conditions, provide a reasonable basis for analyzing true transport costs. Although owning a car is expensive, driving is so cheap for any particular trip that other problems such as congestion, pollution, or reduced quality of life become the constraints to further increases.
Users have little incentive to limit their driving to trips in which benefits exceed total costs.
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