The rule includes or encompasses instances that the background justification behind the rule would not cover, as in the Kirby and Church of the Holy Trinity cases, as with the driver driving safely at 70, and as with an ambulance which might fall within the literal scope of the "no vehicles in the park" rule. In such cases the reach of a rule is broader than the reach of its background justification, and so we say that the rule is overinclusive.

Unknown, Frederick Schauer - Thinkin…, loc. 46