In Pennsylvania Turnpike Commission v. Commonwealth, 587 Pa. 347, 899 A.2d 1085 (2006), the Supreme Court stated that the underlying purpose of Article III, 32 has been recognized as being similar to federal principles of equal protection under the Fourteenth Amendment in that both prohibit unlawful classifications. Legislative classifications must be "'reasonable rather than arbitrary and bear a reasonable relationship to the object of the legislation. In other words, a classification must rest upon some ground of difference, which justifies the classification and has a fair and substantial relationship to the object of the legislation.'" Id. at 364, 899 A.2d at 1095.