# Road Vehicles Lighting Regulations (Northern Ireland) 2000, Paragraph 1


A roof bar shall be at least 1000mm in length, excluding the warning lights and shall not exceed the width of the bus.

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Source: https://www.legislation.gov.uk/nisr/2000/169/schedule/22C/paragraph/1 (the official version)
Page: https://openlegislation.uk/road-vehicles-lighting-regulations-northern-ireland-2000/schedule-22C/paragraph-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.