# The Traffic Signs Regulations and General Directions 2016, Paragraph 5

Extent: E+W+S

The safe height shown on the first associated plate must be between 1 foot 3 inches and 2 feet (380 mm to 600 mm) less than the height of the lowest part of the overhead wire, of which the sign gives warning, over the highest part of the surface of the carriageway beneath that wire.

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Source: https://www.legislation.gov.uk/uksi/2016/362/schedule/2/part/7/paragraph/5 (the official version)
Page: https://openlegislation.uk/traffic-signs-regulations-and-general-directions-2016/schedule-2/part-7/paragraph-5
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.