The respective widths of the pavements and gutters within the corporate limits of Latrobe on all streets where the same may not already be adopted shall be as follows:
A.
On streets 60 feet wide, the pavement shall be 12 feet in width.
B.
On streets 50 feet wide, the pavement shall be 10 feet where street is paved and 9 1/2 feet wide when street is not paved.
C.
On streets 40 feet wide, the pavement shall be eight feet in width.
D.
On streets 30 feet wide, the pavements shall be five feet in width.