15. No advertising sign may exceed(1) 3 metres in height, if it is displayed within 30 metres of a highway, rest area or lookout;
(2) 5.50 metres in height, if it is displayed 30 metres or more therefrom but within 60 metres thereof;
(3) 11 metres in height, if it is displayed 60 metres or more therefrom but within 90 metres thereof;
(4) 16 metres in height, if it is displayed 90 metres or more therefrom.