We have been shown a lesser known clause that we feel should be put into every planning application 

 

 

 

No advertisement shall be sited or displayed so as to-
(a) endanger persons using any highway, railway, waterway, dock, harbour or aerodrome (civil or military);
(b) obscure, or hinder the ready interpretation of, any traffic sign, railway signal or aid to navigation by water or air; or
(c) hinder the operation of any device used for the purpose of security or surveillance or for measuring the speed of any vehicle.