Hong Kong Regulations

ROAD TUNNELS (GOVERNMENT) REGULATIONS - REGULATION 4

Temporary maximum speed limits

(1) In addition to any traffic sign specified under regulation 3(1) or varied
under regulation 3(2) fixing a speed limit, the Authority where it considers
that a temporary risk of danger to the public or of damage to a tunnel will or
is likely to arise may, at any time and without notice, display such
traffic sign as it may think appropriate for the purpose of fixing a temporary
maximum speed limit for vehicles using that tunnel.

(2) No person shall drive a vehicle in a tunnel where a temporary maximum
speed limit is fixed and a traffic sign in respect thereof is displayed under
paragraph (1), at a speed in excess of the maximum so fixed.