Each member of the Pennsylvania State Police and each person employed as a Park Guard in policing the State park areas and the highways therein, shall be permitted to have at least twenty-four consecutive hours of rest in every calendar week, except in emergency cases for the suppression of riots or tumults, or the preservation of the public peace in times of war, riot, conflagration or public celebration, and to have an annual vacation of not less than fourteen days without diminution of his salary or compensation as provided according to law.
71 P.S. § 254