The Implementing Regulation on Air-raid Practice Article 10

In executing air-raid practice, it may limit or control the use of whistle, trumpet, horn, alarm, and megaphone, it shall be coordinated by the Ministry of National Defense, the Ministry of Interior, the Ministry of Communication, the Council of Agriculture, municipal cities, county governments, and public utilities which are concerned with air-raid practice pursuant to the following rules:1.The whistle and trumpet of railway and mass rapid transit system shall be used in short voice lasts for 3 to 4 seconds, and it shall not ring for over 5 times unless an urgent safety measure is taken.2.Automobile trumpet shall be used in short voice less than 1 second, and it shall not ring for over 2 times.3.The fire engine, ambulance, police vehicle and patrol shall be equipped with trumpet; the other acoustic equipment is strictly prohibited.4.Automotive and non-automotive ships (including military ship and fishery boat) shall be equipped with whistle and horn, unless it is handled pursuant to the International Maritime Collision Prevention Rule, the whistle and horn shall be prohibited within 10 kilometers nearby the harbor. No exception but at the point of setting off or a significant damage is aroused.5.Each civil air-raid troop at the harbor shall have close contact with coastal radio station, and it shall be equipped with telecommunication tools to transfer air-raid related information.Once each coastal radio station receives air-raid information from civil air-raid troops, it shall promulgate signals to all the units pursuant to the rules.