Hong Kong Regulations

IMMIGRATION REGULATIONS - REGULATION 4

Prescribed immigration examination signal

The immigration examination signal referred to in section 3(1) of the
Ordinance shall be-

   (a)  by day, the letters H.N.N., shown by means of signal flags; and

   (b)  by night, three lights coloured white in a vertical line one over the
        other, equally spaced at distances of not less than 1 m and visible
        from any direction at a distance of at least 1 nautical mile. (L.N.
        268 of 1977; L.N. 103 of 1980)