Belfast·SPG008 Advertising and Signage·Page 15·4.6.2(e)
Types of illuminated signs that may be refused on road safety grounds
Illuminated signs may be refused if their means of illumination is visible from the road, they could be confused with traffic lights, or they create glare, dazzle or distraction to road users.
Illuminated signs:
• Where the means of illumination is directly visible from any part of the road.
• Which, because of their colour, could be mistaken for, or confused with, traffic lights or any other authorised signals.
• Which, because of their size or brightness, could result in glare or dazzle, or otherwise distract road users especially in wet or misty weather.
Source — /Users/richardhill/Documents/planning-arch-project/data/documents/belfast/SPG008 Advertising and Signage.pdf