Paragraph 23
Nothing in paragraph (a) of subsection (1) of section thirty-nine of the Act shall prohibit a person passing on foot along a length of road during a period during which vehicles are moving therein—
(a)
if the maximum speed at which vehicles may run therein does not exceed six miles per hour; or
(b)
if there is a continuous clear space not less than two feet in width between the vehicles and one side of the road.