# The Town and Country Planning (Control of Advertisements) Regulations 1989, Paragraph 5


No advertisement shall be sited or displayed so as to obscure, or hinder the ready interpretation of, any road traffic sign, railway signal or aid to navigation by water or air, or so as otherwise to render hazardous the use of any highway, railway, waterway (including any coastal waters) or aerodrome (civil or military).

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Source: https://www.legislation.gov.uk/uksi/1989/670/schedule/1/paragraph/5 (the official version)
Page: https://openlegislation.uk/town-and-country-planning-control-of-advertisements-regulations-1989/schedule-1/paragraph-5
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.