# The Rail Vehicle Accessibility (Non-Interoperable Rail System) Regulations 2010, Paragraph 1: Doors


Where the opening of all the passenger doors in the side of a rail vehicle is activated by a member of the operator's staff, or activated automatically, the audible warning device required by paragraph 3(3) of Part 1 of this Schedule must emit a distinct sound for a period of not less than 3 seconds commencing when the doors begin to open.

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Source: https://www.legislation.gov.uk/uksi/2010/432/schedule/1/part/2/paragraph/1 (the official version)
Page: https://openlegislation.uk/rail-vehicle-accessibility-non-interoperable-rail-system-regulations-2010/schedule-1/part-2/paragraph-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.