Poles, towers and other structures supporting aerial lines must—
(a) be as vertical as is practicable; and
(b) if located on or near a roadside, not lean over the kerb line in the direction of a vehicular carriageway more than 5 degrees from the perpendicular and not lean in any other direction more than 10 degrees from the perpendicular; and
(c) if located elsewhere, not lean more than 10 degrees from the perpendicular in any direction.