The Traffic Signs Regulations and General Directions 2016 (TSRGD) is a regulatory document which details every traffic sign and road marking prescribed for use in the UK. The TSRGD also stipulates the conditions under which each sign may be used.
Where there is no suitable prescribed sign in the TSRGD for a specific purpose, an application can be made to the Scottish Government for authorisation to use a specially designed Non-Prescribed sign in Scotland. Applications to use a Non-Prescribed sign or marking may only be made by the relevant Road Authority.
The following documents contain information on previously authorised Non-Prescribed signs (NPs) and the application process: