Belfast·SPG008 Advertising and Signage·Page 15·4.6.2(h)
Signs visible from motorways or special roads
Signs sited or designed primarily to be visible from motorways or other special roads may be refused on road safety grounds.
Signs sited or designed primarily to be visible from a motorway or other special road.
Source — /Users/richardhill/Documents/planning-arch-project/data/documents/belfast/SPG008 Advertising and Signage.pdf