The optimum level of road usage would be that at which the external costs of motoring were zero.

Name: The optimum level of road usage would be that at which the external costs of motoring were zero.
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The optimum level of road usage would be that at which the external costs of motoring are equal to the marginal social benefits, not necessarily zero. This accounts for the balance between the benefits of road usage and the negative externalities (such as pollution and congestion) it causes.

The Optimum Level of Road Usage Would Be That at Which