Circular road signs are available in 300mm, 450mm and 600mm sizes.
Other sizes available on request
Class RA1 Engineering Grade or RA2 High Intensity Prismatic reflectivity
Wall mounted or with rear channel for post fixing
Official specification Sign Posts.
Both the give way and stop sign are regulatory signs, meaning that they are giving an order.
The difference between give way and stop sign other than the shape, is the text telling you what must be done. A give way sign tells you that you must give way to traffic ahead and a stop sign tells you that you must stop.