# Motor Vehicles (Invalid Carriages) Regulations (Northern Ireland) 1999, Regulation 12: Audible warning instrument


(1) A Class 3 invalid carriage shall be fitted with a horn, not being a reversing alarm or a two-tone horn.
(2) The sound emitted by any horn fitted to an invalid carriage shall be continuous and uniform and not strident.

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Source: https://www.legislation.gov.uk/nisr/1999/478/regulation/12 (the official version)
Page: https://openlegislation.uk/motor-vehicles-invalid-carriages-regulations-northern-ireland-1999/regulation-12
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.