(a) The standard for construction of curbs on each side of any municipal street or of any connecting street or road for which curbs have been prescribed by the governing body of the municipal corporation having jurisdiction thereover shall be not less than one ramp per lineal block giving on the crosswalks at intersections. Such ramps shall be at least 40 inches wide and shall be so constructed as to allow reasonable access to the crosswalk for physically disabled persons.

(b) Standards set for curb ramping under subsection (a) of this Code section shall not apply to any curb existing on July 1, 1974, but shall apply to all new curb construction and to all replacement curbs constructed at any point in a block which gives reasonable access to a crosswalk; provided, however, that the standards set for curb ramping under subsection (a) of this Code section shall apply to curbs on each side of the street circling the state capitol; provided, further, that the standard for construction of curbs on each side of the street circling the state capitol shall be not less than two ramps per lineal block giving on the crosswalks at intersections.