36 Pa. Stat. § 251
Out of the moneys in the Motor License Fund of the Commonwealth, available in any fiscal biennium for the construction and improvement of State highways, and bridges on State highways, such sum as shall be specified by the General Assembly shall hereafter be apportioned by the Department of Highways for expenditure in the several counties of this Commonwealth, in the ratio that the unimproved mileage of State highways in any county bears to the total unimproved mileage of State highways in the Commonwealth; but the amount to be allocated for expenditure in any county shall not be more than six hundred thousand dollars ($600,000), or less than two hundred thousand dollars ($200,000), in any fiscal biennium; and, if the allocation above provided for allows to any county an amount in excess of the maximum herein permitted, then the amount representing the excess over the maximum shall be deducted in each such case, and shall be credited to the counties which, by the aforesaid allocation, would receive less than the minimum allotment, but only to the extent necessary to give each of such counties the minimum allotment of two hundred thousand dollars ($200,000). If after such deductions from the allotments exceeding the maximum, and credits to the counties below the minimum, any moneys remain unallocated, the same shall again be reallocated to the several counties (excepting those having a maximum allotment) on the ratio of unimproved mileage as first provided in this section.
The moneys thus available for expenditure in any county shall be expended by the Department of Highways for State highway and bridge construction and improvement in boroughs, towns and townships, on any State highway, whether the same be designated as a primary State highway or secondary State highway, without any assistance whatsoever from the county or any borough, town or township, any law to the contrary notwithstanding.
36 P.S. § 251