Control of erection of hoardings and display of advertisements

4. No person shall-

(a) erect, or cause to be erected, or authorize the erection of any hoarding except

in accordance with the provisions of section 5 or section 6; or

(b) display or cause to be displayed any advertisements to which this Law applies except (i) upon a hoarding lawfully erected in accordance with the provisions of section 5 or (ii) in accordance with the provisions of section 6.