Doesn't sound like something I've seen in Traffic Signs Regulations and General Directions [0] There are sometimes signs which only apply at school times, they

Doesn't sound like something I've seen in Traffic Signs Regulations and General Directions [0] There are sometimes signs which only apply at school times, they say things like "School 20 when lights show" - I think I've seen them in Scotland https://www.legislation.gov.uk/uksi/2016/362/made https://www.legislation.gov.uk/uksi/2016/362/made