Works on dual carriageways with a speed limit of 40 mph or less - HAUC

How much over 40 mph is allowed in the UK? - Quora

Rigid roads (Appendix A5) - HAUC

Coned area - HAUC

Footway and footpath works – look after pedestrians - HAUC

Dual Carriageways - SmartDriveUK

Dual Carriageway

Sequence for setting out signs - HAUC

Know Your Speed Limits - Driving Test Success

Dual carriageway - Wikipedia

Quazar Cone Signs, Chapter Traffic Management Kit