*484 CONCURRING OPINION
Chief Justice CASTILLE.I join Mr. Justice McCaffery’s learned Majority Opinion in its entirety. I write only to express some supplemental thoughts on why I believe there is no basis for suppression in this case.
What this case reveals, more than anything else, is an unavoidable deficiency in the constitutional rules, courts are called upon to fashion. The guidelines set forth in Commonwealth v. Tarbert, 517 Pa. 277, 535 A.2d 1035 (1987) (plurality) and Commonwealth v. Blouse, 531 Pa. 167, 611 A.2d 1177 (1992) were adopted in the context of particular cases and controversies, and the facts of those cases necessarily acted to limit the comprehensiveness of the constitutional rule fashioned going forward. This case has revealed an uncontemplated (though it now looks predictable) real-world complication.
Mr. Justice Saylor’s Dissenting Opinion states that traffic back-up at a checkpoint is “sui generis, in that it is always a foreseeable condition, as it stems from the nature of the activities that take place there[.]” Dissenting Op. at 488, 957 A.2d at 730. I agree that this case has revealed that fact. Notably, however, traffic buildup was not so foreseeable as to be factored into the Tarbert-Blouse guidelines. Going forward, I would have no difficulty with adopting the Dissenting-Opinion’s perfectly reasonable view that, in the administrative authorization for future roadblocks, there can and should be some provision for the contingency that revealed itself — and revealed a gap in our rule — in the crucible of this case — a contingency that, I agree, will likely be common with roadblocks. But I would not fault the police here, who tried to adhere to the rule then in existence, and then acted reasonably in the face of a contingency we had not accounted for. Police did not seek to skirt the rule we fashioned: the Tarbert-Blouse guidelines were followed to the letter and, as all agree, the police here acted in good faith.
The fact of the incompleteness of our existing rule, and police good faith do, I believe, implicate the question of *485whether suppression should be deemed available. The central command of the Fourth Amendment, and Article I, Section 8, is reasonableness. Where police follow the existing case decisional guideline, and act reasonably in the face of an uncontemplated factor, I see no basis for suppression. In my judgment, the roadblock in this case having been properly authorized, and the stop having been reasonably conducted under the circumstances, the windfall of suppression should not be made available.